Merge pull request #114 from GL-MPRI-2014/config

Config
Added exception for illegal attacks
Added call to pop when quitting
Now fullscreen is handled through settings
Update concerning fullscreen
Using escape to quit settings or slider

It also checks if we're still running after
handling events in case one of them had terminated the program.
Now able to attack without moving
Added played units management
Bugfixes, attacks & game_engine cleaning

-Attacks are now working (infantries are OP)
-Cleaned game_engine (no more refs)
-Fixed a bug in Logics in range calculation
-Ranged units are able to move-attack (for testing purposes)
Added two zeros to a constant!
Units now die & fixed a bug in Player
Removed the ugly two boffer implementation.
Merge branch 'master' of github.com:GL-MPRI-2014/GL_MPRI_2014
engine and interface settings. Move everything to common/config/
global config possibility
Merge branch 'master' into config