Added module for kick/ban/unbanning someone

Kicking - kicks an user by username using the admin's name as reason.
```
<admin> bhottu: kick user
* <bhottu> kicked user (admin)
```
Banning - bans an user by username or ident
```
<admin> bhottu: ban user
* <bhottu> sets mode +b on user!*@*
<admin> bhottu: ban *!*@custom.host.mask
* <bhottu> sets mode +b on *!*@custom.host.mask
```
Unbanning
```
<admin> bhottu: unban user
* <bhottu> sets mode -b on user!*@*
<admin< bhottu: unban *!*@custom.host.mask
* <bhottu> sets mode -b on *!*@custom.host.mask
```