Particles Cache, Reloads, Game music, and panel coloring

-Added a magazine to main gun that requires reloading

-Add a reload button R or middle mouse button

-Add song to main game

-Make both songs loop

-Adjust coloring of ui panels

-Adjust helicopter health

-Add heal sound

-Added a particles cache to fix lag on first particle load

-Added a reload label that flashes while reloading

-Add health bars to enemies