Added a tower sprite and some terrible rendering code.

- Rendering code does not work properly. Rotation is all messed up. When
  the turret rotates it's centre point moves. Need to figure out how to
  fix this. Probably simple.
added new mob class
Modifid freqMob to change the colour of mobs as they take damage, a precursor to freeze towers
Modified to use new freqMobs
continued editing freqMob and squashed some bugs.
continued editing freqMob and squashed some bugs.
Merge branch 'frequencyscaling' of https://github.com/TeamAudioplode/AudioplodePrototype into frequencyscaling
Size dependent sounds
small bug in sound generation...
reversed sound directions; big things made high frequency sounds
Revert "Added a tower sprite and some terrible rendering code."

This reverts commit 83f0dd0e407e8ddf7fe78e277e9b54602752d363.
Added tower temperature display and LAZORZ!
Merge branch 'master' of github.com:TeamAudioplode/AudioplodePrototype into GUI
extra comments from a long time ago