Release-2.0.0 CS2Retake

Rework of the allocator system in a way more modular way.
The default allocator is a weapon menu based one that can be opened using !guns.

The weapons are then being saved in a SQLite3 database on the server so that the user does not have to configure the weapons every time the server restarts.
As well there is the way to have the allocator only cache all the chosen weapons.