Merge branch 'master' into dev
* cleaned up unnecessary debug output

+ chat messages for backup status
+ added StringHelper class; provides method to help with tab-completion
+ added YABMCommand class to provide commands; currently only supports command to retrieve config values

* ConfigHandler now additionally holds all configuration entries in a Map<String, Object>
* YABM now registers YABMCommand on server starting
+ implemented set and startbackup commands

* refactored command handling into seperate methods
* removed unnecessary check in BackupTickHandler
* backup names now get generated based on whether it's a dedicated server or single player
* added a Map to hold all configuration fields in ConfigHandler additionally to the static fields
* reformat code
Merge branch 'dev'