Ace of Spades OpenGL - Dynamic sounds and entities

Spent some time abstracting away some of features, including game modes, into a more generic system. This allows for better modding abilities, like expanding upon the disco script to play a looping disco sound. Dynamic entities also mean that we can create and change entities however we want (right now, I’m just spawning helicopters, but the intel and base are also just generic entities now). Again, suggestions should not go here.