Added the player spawner.
Added the OptionsManager to get options from program arguments.
Added getter for string and int options.
Added a float and double getter for OptionsManager.
Merge branch 'feature/Arguments_Interpreter' into develop
Added new players (with different properties).
Modified properties of players.
Merge branch 'feature/New_players' into develop
Added the possibility to select players.
Removed useless level files.
OptionsManager now read a configuration file to load the game configuration.
Player keyboard keys are now set according to the player number (removed from players templates).
Merge branch 'feature/Player_selection' into develop
Added the beginning of the Launcher.
Game now accept parameters with space and quotes.
Can launch a level from the launcher.
Added player list in launcher.
Added an option button
Better view centering.
Added split-screen mode.