More bugfixes

[mlauss2]

More bug/warningfixes and ipdates to get it building on Apple/Clang toolchains. based on feedback in #90

• QUAD_MAX is a reserved symbol in xnu's "limits.h" file
• clang doesn't like passing std::string to logWrite()
• disable clang's excessive warnings about unhandled enum values in switch() statements
• fix lots of clang warnings about assignments inside while() without extra brackets.
• adjust the min/max/clamp(size_t) functions to u64, since size_t == u32 on 32bit targets
• LINE_MAX is another reserved symbol on xnu/apple.
• change the size_t in memoryRegion, which is written out to savegames, to an u64, to keep apple toolchain happy and the savegame format independent of the target architecture size.

[jodaco]

Definitely get much further with this PR on Mac, sent a minor PR to your original branch for CMakeLists to at least get the build going on Mac