Did various changes:
1.) Transformed linedetection into Game class => less confusing naming
(linedetection : linefinder)
2.) Merged line detection functionalities implemented in main into
Game::detect(...).
3.) Documentated a bunch of functions and classed.
4.) Created entities class for the gameplay.
5.) Declared two preprocessor constants for error/success indication.
Should be implemented otherwise when there is time.
6.) Implemented very very basic game prototype in Game::play.