Added a 'space' system similiar to the 'weight' system, miscellaneous fixes and changes.

Space system can be disabled through 'enable_space_system' - default is off.
Fixed /ContFill using entity.inventory instead of entity.cwInventory as target inventory.
Changed how Clockwork.inventory:CalculateWeight() calculates weight - now accounts for 'weight' query proxies.
Added 'default_inv_space', 'cash_space' config keys.