NotnHeavy

Results 3 issues of NotnHeavy

- Fixed fixed-size array syntax error in tf2utils.inc - Fixed few warnings in cwx.sp - Moved IsEmpty() check in GetLoadoutItem so if we no longer equip a custom weapon, it...

This probably seems like a strange suggestion but should this become mainstream, it should allow me to incorporate some changes in a weapon manager plugin that I am currently in...

This PR does nothing except make `sp::PluginRuntime::InstallBuiltinNatives()` a virtual function, allowing it to be called in external libraries. I'm not sure why this isn't already exposed - if there is...