Fixed an error: player time could be abused by reconnecting.
Instead of player tables, the values are stored as numbers inside playersession. Added also if player is playing singleplayer then create the player.name is directly on player_join created in the playsession table.
If the player does not exist within the dataset then create it with online_time as value.
Removed all local files for player session. Player sessions are now fetched from the scenario-data.
