Detect changes to PBXAggregateTarget during build up-to-date checking

[lacasseio]

As a user building Xcode targets using Gradle, I want the Gradle tasks representing the Xcode targets to be out-of-date only when its build specification change during an incremental build so I can have accurate feedback.

Sub-stories

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1. Detect changes to PBXShellScriptBuildPhase during target build up-to-date checking #779
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   a:enhancement in:xcode-build-adapter +2
2. Detect changes to PBXHeadersBuildPhase during target build up-to-date checking #780
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   a:enhancement in:xcode-build-adapter +2
3. Detect changes to PBXCopyFilesBuildPhase during target build up-to-date checking #781
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   a:enhancement in:xcode-build-adapter +2
4. Detect changes to PBXResourcesBuildPhase during target build up-to-date checking #782
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   a:enhancement in:xcode-build-adapter +2
5. Detect changes to PBXSourcesBuildPhase during target build up-to-date checking #783
   a:enhancement in:xcode-build-adapter +2
6. Detect changes to PBXFrameworksBuildPhase during target build up-to-date checking #784
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   a:enhancement in:xcode-build-adapter +2

Acceptance Criteria

• Any changes to the product type. It usually means deleting and adding a different target with the same name.
• Any changes to the product name.
• Any changes to the build phases, e.g. ordering, adding, and removing.
• Any changes to effective build settings (including project's build settings that are not overwritten)