- added class GuildHandler -> use this for commands that sould be run on a server
- added class Servant -> handles commands, used by GuildHandler
- added connected getter to DJ
- changed from checking for Connection to checking if connected
- added possibility to assign a VoiceChannel at connecting
- commands now contain the prefix instead of being a child element of it
- added passing additional arguments as third parameter of the command callback
- removed complex command parsing function, rewrote it with better pattern matching
- removed music commands from bot.js and moved them to GuildHandler class
- changed from cmd.createCommand to createGlobalCommand