[PrefixHeader] Style fixes
[AggretateTarget] Expose specs by build configuration
[TargetEnvironmentHeader] Refactor
[Project] Add preprocessor definition for build configurations
[PrivatePodXcconfig] Add inherited to GCC_PREPROCESSOR_DEFINITIONS
[Project] Coherce preprocessor definitions to an array
[Integration] Disable xcproj in Xcodeproj
[Changelog]