fix: enforce JAXB field order in Project with @XmlType(propOrder)

[lawrencewang49]

Purpose of this PR

This PR addresses an issue discovered during Nondex testing. Nondex is a tool that repeatedly runs JUnit tests with different thread schedules to detect nondeterministic behavior in concurrent or order-sensitive code. The original Project class did not specify a fixed order for JAXB-serialized fields, and so fields such as scenes, structure, application, transport, and arrangement were marshaled in an undefined order, which could vary between runs. Nondex detected that the DawProject.validate tests sometimes failed because XML validation against the schema depended on the order of elements, making the test non-deterministic.

Changes Made:

• Added @XmlType(propOrder = {"scenes", "structure", "application", "transport", "arrangement"}) to the Project class.
• This explicitly defines the JAXB serialization order, eliminating nondeterminism in the generated XML

Results:

• Ensures consistent serialization for schema validation and other XML consumers
• Eliminates nondeterministic test failures that for tests that validate project XML

Steps to reproduce

1. Add the following to plugins in build.gradle: id 'edu.illinois.nondex' version '2.2.1'
2. Add the following to the bottom of build.gradle: apply plugin: 'edu.illinois.nondex'
3. Add the following above dependencies in build.gradle:

tasks.withType(Test) {
    testLogging {
        events "passed", "skipped", "failed" 
        exceptionFormat "full" 
        showExceptions true
        showCauses true
        showStackTraces true
    }
}

4. Run ./gradlew nondexTest --tests "com.bitwig.dawproject.DawProjectTest.createAudioExample",
   ./gradlew nondexTest --tests "com.bitwig.dawproject.DawProjectTest.createMIDIAutomationInClipsExample",
   ./gradlew nondexTest --tests "com.bitwig.dawproject.DawProjectTest.validateComplexDawProject",
   and ./gradlew nondexTest --tests "com.bitwig.dawproject.DawProjectTest.validateDawProject",
   and you should see output similar to below:

DawProjectTest > createAudioExample FAILED
    java.io.IOException: jakarta.xml.bind.UnmarshalException
     - with linked exception:
    [org.xml.sax.SAXParseException; lineNumber: 3; columnNumber: 16; cvc-complex-type.2.4.a: Invalid content was found starting with element 'Transport'. One of '{Application}' is expected.]
        at com.bitwig.dawproject.DawProject.validate(DawProject.java:242)
        at com.bitwig.dawproject.DawProjectTest.saveTestProject(DawProjectTest.java:361)
        at com.bitwig.dawproject.DawProjectTest.createAudioExample(DawProjectTest.java:295)
        at com.bitwig.dawproject.DawProjectTest.createAudioExample(DawProjectTest.java:178)

        Caused by:
        jakarta.xml.bind.UnmarshalException
         - with linked exception:
        [org.xml.sax.SAXParseException; lineNumber: 3; columnNumber: 16; cvc-complex-type.2.4.a: Invalid content was found starting with element 'Transport'. One of '{Application}' is expected.]
            at app//jakarta.xml.bind.helpers.AbstractUnmarshallerImpl.createUnmarshalException(AbstractUnmarshallerImpl.java:296)
            at app//org.glassfish.jaxb.runtime.v2.runtime.unmarshaller.UnmarshallerImpl.createUnmarshalException(UnmarshallerImpl.java:539)
            at app//org.glassfish.jaxb.runtime.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal0(UnmarshallerImpl.java:224)
            at app//org.glassfish.jaxb.runtime.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal(UnmarshallerImpl.java:189)
            at app//jakarta.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(AbstractUnmarshallerImpl.java:152)
            at app//jakarta.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(AbstractUnmarshallerImpl.java:205)
            at app//com.bitwig.dawproject.DawProject.validate(DawProject.java:240)

or

DawProjectTest > createAudioExample FAILED
    java.io.IOException: jakarta.xml.bind.UnmarshalException
     - with linked exception:
    [org.xml.sax.SAXParseException; lineNumber: 22; columnNumber: 14; cvc-complex-type.2.4.d: Invalid content was found starting with element 'Scenes'. No child element is expected at this point.]
        at com.bitwig.dawproject.DawProject.validate(DawProject.java:242)
        at com.bitwig.dawproject.DawProjectTest.saveTestProject(DawProjectTest.java:361)
        at com.bitwig.dawproject.DawProjectTest.createAudioExample(DawProjectTest.java:295)
        at com.bitwig.dawproject.DawProjectTest.createAudioExample(DawProjectTest.java:178)

        Caused by:
        jakarta.xml.bind.UnmarshalException
         - with linked exception:
        [org.xml.sax.SAXParseException; lineNumber: 22; columnNumber: 14; cvc-complex-type.2.4.d: Invalid content was found starting with element 'Scenes'. No child element is expected at this point.]
            at app//jakarta.xml.bind.helpers.AbstractUnmarshallerImpl.createUnmarshalException(AbstractUnmarshallerImpl.java:296)
            at app//org.glassfish.jaxb.runtime.v2.runtime.unmarshaller.UnmarshallerImpl.createUnmarshalException(UnmarshallerImpl.java:539)
            at app//org.glassfish.jaxb.runtime.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal0(UnmarshallerImpl.java:224)
            at app//org.glassfish.jaxb.runtime.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal(UnmarshallerImpl.java:189)
            at app//jakarta.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(AbstractUnmarshallerImpl.java:152)
            at app//jakarta.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(AbstractUnmarshallerImpl.java:205)
            at app//com.bitwig.dawproject.DawProject.validate(DawProject.java:240)

or

DawProjectTest > createMIDIAutomationInClipsExample FAILED
    java.io.IOException: jakarta.xml.bind.UnmarshalException
     - with linked exception:
    [org.xml.sax.SAXParseException; lineNumber: 19; columnNumber: 14; cvc-complex-type.2.4.a: Invalid content was found starting with element 'Scenes'. One of '{Structure, Application}' is expected.]
        at com.bitwig.dawproject.DawProject.validate(DawProject.java:242)
        at com.bitwig.dawproject.DawProjectTest.saveTestProject(DawProjectTest.java:361)
        at com.bitwig.dawproject.DawProjectTest.createMIDIAutomationExample(DawProjectTest.java:348)
        at com.bitwig.dawproject.DawProjectTest.createMIDIAutomationInClipsExample(DawProjectTest.java:195)

        Caused by:
        jakarta.xml.bind.UnmarshalException
         - with linked exception:
        [org.xml.sax.SAXParseException; lineNumber: 19; columnNumber: 14; cvc-complex-type.2.4.a: Invalid content was found starting with element 'Scenes'. One of '{Structure, Application}' is expected.]
            at app//jakarta.xml.bind.helpers.AbstractUnmarshallerImpl.createUnmarshalException(AbstractUnmarshallerImpl.java:296)
            at app//org.glassfish.jaxb.runtime.v2.runtime.unmarshaller.UnmarshallerImpl.createUnmarshalException(UnmarshallerImpl.java:539)
            at app//org.glassfish.jaxb.runtime.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal0(UnmarshallerImpl.java:224)
            at app//org.glassfish.jaxb.runtime.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal(UnmarshallerImpl.java:189)
            at app//jakarta.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(AbstractUnmarshallerImpl.java:152)
            at app//jakarta.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(AbstractUnmarshallerImpl.java:205)
            at app//com.bitwig.dawproject.DawProject.validate(DawProject.java:240)