* [tests] Minor refactor to get better Xcode version parsing.
* Rename Configuration.XcodeVersion to XcodeVersionString.
* Add Configuration.XcodeVersion a parsed Version instane of XcodeString.
* [tests] Ignore all 'MT0099: Not linking with WatchKit because Xcode 11 beta 1' warnings in tests.
* [tests] Adjust min OS version tests for Xcode 11b1.
* [tests] Adjust tests for changes in 'nm' output.
* [tests] Adjust tests for name changes in Clang.
* [tests] Adjust tests for changes in ld warning format.
* [msbuild] 'metal' and 'metallib' aren't in PATH anymore, so use xcrun to execute them.
* [msbuild] Fix DevicePlatformBinDir for the Metal and MetalLib targets on iOS.
Also set the SDKROOT variable, otherwise metal and metallib don't work
properly, and revert the previous attempt at a fix (use xcrun).
* [tests] Simplify version parsing code to not version parse anymore.
* [tests] Add FIXME for once Apple fixes the WatchKit disappearance.
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