Build: Upcasing BAKGE_EXPORTS definition
Build: Appending targets in main CMake lists
List append was not working on Win32 for some reason, when it happened in
a different module than the one the variable was declared in.
Newline fix.
Utility: Add PlatformDeinit extern function
These are defined in platform-specific utility source modules
Bakge.h: Fixed #ifdef snafoo
Without -D_DEBUG BGE_API is defined empty, even if on MSVC, due to the
previous predicate being defined(MSVC) && defined(_DEBUG)
Bakge.h: Defining BGE_VER_REV for version revision