Merge pull request #7 from wladi-do/master

Implement chip and field
Don't compile Gl* classes if artoolkit was not found
switch to GameWidget, move drawing stuff
calculate relative position of chip marker and print it to debug stream
minor corrections, emit arChipDropped
clean up merge artifacts
add QColor attribute, getter and setter to Player
emit arChipDropped only if marker newly moved down and column within correct bounds
Merge branch 'master' of https://github.com/dschmidt/c4
dropChip implemented + ai fix, new : bool checkFinished()
Merge pull request #9 from jangoclik/master

dropChip implemented + ai fix, new : bool checkFinished() in GameModel
shift chip rendering position back to marker
gameFinished signal
Merge pull request #11 from jangoclik/master

gameFinished signal
Merge pull request #10 from roybaer/master

QColor in Player, correct arChipDropped, minor cleanup
Merge pull request #12 from wladi-do/master

chip color & field reworked
Add Settings class
draw field with qDebug()
Merge pull request #13 from jangoclik/master

draw field with qDebug()
WIP: don't merge