Permissions

Permission system started by daranable and continued by me.
It currently contains a placeholder that just allows a bunch of things and a CPPI module that really should use gmod hooks to work with non-CPPI prop protections. (Do they even exist?)

It is also missing configuration features for the default provider. Currently it is pretty much useless, since the way to configure it is by editing the SQLite Database directly.

Apart from this, it is working and definitely better than no permission system  at all.

See #14