Adding game list, new navbar entrie
Report management.

Report are registered in the database.
Refactor coding style
Removed unused imports
Refactored handling of game loading
More refactoring
Refactored logging mechanism
Refactored game engine classes
Implemented action handler in game library
Removed unused method
Games list and access to selected game page
Games list : fix conflict
Refactored handling of GameEntity's positionning
Merged 20_game_view into feature/turns