Added SentChatMessages-History (including navigation)
Added Tab-Completion for Main-Commands
Added Tab-Completion for Sub-Commands
Added Tab-Completion for Player-Names [Now finally fixed and working correctly]
Improved some english translations
Improved a lot of german translations
Fixed a few bugs and bad code regarding "default commands"
Development started on a new chat command handling system (Not in use yet)
Fixed some stuff previously noted/criticized by other developers in a previous the code review
Added new Start-Parameter "--playername PLAYERNAME"
Added new Start-Parameter "--randomplayername"
