Overhauled drugs code

Drug objects are now declared and defined similar to other objects
(skins, items). More may be added now that it's easier.

Now, drug effects are displayed on the body preview UI element when a
player views their inventory screen.

Fixed some other issues with drug effects.

Fixed some SQL code for counting table columns.
Fixed body preview skin

The body preview now uses the player skin.
Added free cam module for admins