big update

totally fixed animation on heroes, fixed above-head health bars, added
exit menu prompt on both hero and overlord side by pressing excape or
clicking the gui button, added hero gui with working health bar(looks
like shit atm), fixed some layer issues, fixed controls so that you
didnt have to be moving in the direction, you simply have to be trying
to move in a direction to attack in it, attacking while moving only
slows you down to 80% normal speed instead of half speed, added exit
button in main menu