Move to Make/Use Custom CMake Not Generated by VS

[kryzet]

Currently, our build system relies on CMake code originally generated by Visual Studio. I have attempted multiple times to add clang-cl as a build target and failed, so I think moving to Make (of which I am familiar with GNU Make) or writing custom code for CMake to configure the build system might make it easier to manage it later. Of course, if we work with CMake, that would allow us to use Ninja, and switching to something else might make it difficult to use MSVC's Hot Reload feature. I think that if the feature is only available through Visual Studio's debugger, then it doesn't matter.