[Xcode] Add more test files.
[Xcode] Missing <cfloat> in AnyTest.cpp
[Xcode] (minor) Add a dummy TimeSpan to clean warnings.
[Xcode] Missing a typename.
[Xcode] CaramelTest project set "Inline Methods Hidden" to NO.
- This may clean linking warnings "… to global weak symbol".
[Xcode] Fix: Use slash in file paths.
[Xcode] Add define CARAMEL_SYSTEM_IS_OF_APPLE.
- Add Apple.mm but not compilable right now.