Buttons

Added some Buttons:

Play / Pause

Mute / Unmute

Fullscreen / Windows (not working in web yet)

Added a RETREAT button. When it seem like you will loose the wave, you can now hit this button (bottom right) and be set back to pre wave state. there you can modify your fortress and from there try to face the same wave again or choose another

Sound is bugged on some machines. A friend told me, that it's cracking for him. Will try to find a machine where it does not work, so i can debug. For now you can just turn it of, if it sounds off.

thats it for today :)