1 year later, big update

A lot has changed internally in my game engine and on this little prototype game since last year. 

One of the biggest changes is multiplayer and more maps, and weapons, and nicer particles: tracers, smoke, surface impact. Decals have also massively improved

I have also ditched irrklang (previous sound system) and have written my own one from scratch that works on linux and android!! (which irrklang couldn't do). I couldn't get around to making the cmake project up to date to build the game for linux (just like the 1 year old build) but maybe ill do that some time later