Jonathan Stuart Horner

Fixed possible undefined behaviour

1

Similiar to that in https://github.com/JACoders/OpenJK/commit/92059a6bdd9a7a256e0a07d550c5fc4db4ddb8f4

Fixed some integer conversion warnings.

1

Warnings present when compiling with clang-cl 11.0

Added CMakePresets.json file.

4

Allows easy build with Visual Studio - CMake integration. Debug and Release configurations added. installRoot set to `build/install/`