[DONE] Groups and permissions refactor

[AntherusCraft]

I think it's a great idea to make the rank system more "definable" so you have more options for each group. In my opinion it is also useful to seperate the permission groups and the groups themselves so you can easily instead of extending groups list permission groups, thats definetly more clear. Another usefull feature would be to be able to manage the groups per command ingame, for example if your an admin of a server but you don't have access to the console/vserver/root or whatever you couldn't manage the groups. 2 commands are enough, one for the groups itself and one for the permission-goups, like so:
/group [add/remove] [Group/MessageColor/Prefix/PrefixColor/Permissions] [Groupname/Color/Prefix/Color/PermissionGroup]
/permission [create/add/remove] [PermissionGroup] [[Permission]]

and then of course the /rank command to give someone a rank.