Detect changes to PBXShellScriptBuildPhase during target build up-to-date checking

[lacasseio]

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Xcode targets using Gradle, I want the Gradle tasks representing the Xcode targets using PBXShellScriptBuildPhase to be out-of-date when its build specification change during an incremental build so I can have accurate feedback.

Open Questions

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1. Does shellPath support Xcode macros?
2. Should we snapshot shellPath as an input file?

Acceptance Criteria

• Changes to the build phase name don't cause the task to be out-of-date. The name of a build phase is only an organizational tool and does not impact the build itself.
• Any changes to inputPaths
  • Adding a new input path
  • Removing an existing input path
  • Changing the resolved path (any change resulting in the same resolved path should be ignored)
  • Changing the input file (or input directory)
• Any changes to outputPaths
  • Adding a new output path
  • Removing an existing output path
  • Changing the resolved path (any change resulting in the same resolved path should be ignored)
  • Changing the output file (or output directory)
• Any changes to shellPath (path only)
• Any changes to shellScript (content only)
• Changes to showEnvVarsInLog should not cause the task to be out-of-date.
• Ignore alwaysOutOfDate (see Support alwaysOutOfDate key on PBXShellScriptBuildPhase #747)
• Using inputFileListPaths causes the task to always be out-of-date
• Using outputFileListPaths causes the task to always be out-of-date