seek_secret table became games, getting back game_id and other stuffs
Updating table_files dependency and improving indentation in src/Makefile
Now adding game_id in doors, door_discovery, scorrs, scorr_discovery
including reference in database diagram
Now enforcing references for door_discovery and doors, also making sure in test_db that for every game all fields are strictly positive (table weren't created sometimes because the random_number was 0)