Add a KeyCode LUT

[Kylogias]

Including an untested branchless operation in HandleInput inside the Windows driver. I also just realized WASM is currently broken in these commits. The CNFG specific keycodes can be easily changed via macros. CNFGKeyToRDCode() is a macro that looks up the value in the LUT for any given system keycode

[cnlohr]

Can you squash your commits? I can't really tell exactly what's going on.