Add Mod.Common Graphics

Moved Graphics to Mod.Common
Check world for null in MusicPlayerLogic to prevent crashing the lobby

Fixes #6517
Prevent player name from becoming part of a formatting string.

fixes #6524
Merge pull request #6522 from obrakmann/fix6517_lobby_music_crash

Check world for null in MusicPlayerLogic to prevent crashing the lobby
Merge pull request #6526 from MatthijsBenschop/debug-crash-fix

Prevent player name from becoming part of a formatting string.
Merge pull request #6521 from steelphase-forks/common-graphics

Add Mod.Common Graphics