Consider Xcode build specification in target build up-to-date checking

[Daniel Lacasse]

As a user using Xcode/Gradle, I want changes to Xcode build specifications and/or input/output files to trigger a delegation to Xcode so that I can receive accurate feedback.

Sub-stories

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1. Detect changes to PBXNativeTarget during target build up-to-date checking #778
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   a:enhancement epic in:xcode-build-adapter +3
2. Detect changes to Xcode legacy targets during target build up-to-date checking
3. Detect changes to Xcode aggregate targets during target build up-to-date checking

Acceptance Criteria

• Any changes to legacy targets are taken into account
  • Changes to the product name
  • Changes to the product type
  • Changes to the build arguments
  • Changes to the build tool path
  • Changes to the working directory (only the path, not the content)
  • Changes to passing build settings in environment variables
  • Changes to the effective build settings values
• Any changes to aggregate targets are taken into account
  • Changes to the product name
  • Changes to the product type
  • Changes to the build phases (only two are supported for aggregated target: shell script and copy files)
  • Changes to the effective build settings values
• Any changes to native targets are taken into account
  • Changes to the product name
  • Changes to the product type
  • Changes to the build phases (all build phases are supported)
  • Changes to the effective build settings values
• Any changes to the project's build settings participating in the target (not overwritten) are taken into account