Port build system to meson (or cmake)

[LaserEyess]

What feature do you want to get added? And how it will work?

Just rehashing this issue snesrev/sm#13. In summary:

• There are currently 2 (or 3, counting tcc) build systems for this project, that's 1 (or 2) too many
• Visual Studio projects/Makefiles are horrendous
• Supporting other platforms and cross compilation will be much easier

I could do one of the following:

1. Port over my CMake PR
2. drop that and do meson instead (I'd prefer this)

Meson is, quite frankly, the least bad build system I've ever used. It works on all platforms currently supported, even the switch, and it's fast and extremely easy to understand. The single downside that it doesn't have Visual Studio (the IDE, not the toolchain) support. This was a deal breaker for snesrev.