Add cvar to disallow the "dropweapon" command.

sv_manualitempickup_allowdrop (default: 1)
- Allow the dropweapon command.

Now affects items. (ex. item_healthkit)

Added relevant cvars:

sv_manualitempickup (default: 1)
- Is manual item pickup enabled?

sv_manualitempickup_aim (default: 1)
- Must the player be aiming at the item?

sv_manualitempickup_auto (default: 0)
- Holding use key picks up items automatically.

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Added option to drop current weapon to pick up another if player is holding too many.

sv_manualweaponpickup_weaponlimitswap (default: 1)

Added option to limit amount of weapons a player can carry at once. (Given weapons bypass this.)

sv_manualweaponpickup_weaponlimit (default: 0)

Fixed errors when trying to spawn invalid entities.

Should now be compatible with weapon drop scripts.

Added option to automatically draw weapon when given.

sv_manualweaponpickup_autodraw (default: 1)