Strip GameMemory from non-vs6 builds by default and/or CMake option

[xezon]

Strip GameMemory from non-vs6 builds by default and/or CMake option. This is required to properly run the Address Sanitizer for example.

I do have a prototype that runs with the vs2022 ZH build, but did not yet get the chance to clean that up.

[xezon]

Implementation started. The end goal is having a new GameMemoryNull.h/.cpp that adds dummies so all macros and functions and every former memory pool and dynamic allocator request defaults to new/delete.