* Convert atmos plaque to generic visualizer
Use generic visualizer for atmos plaque. Also enables zumos plaque to
appear.
* Convert gas canister connecters
* Remove manual layer creation
* Remove gas canister visualizer
* Convert gas analyzers to generic visualizers
* Convert fire visualizer
* Fix layers on plasma and air canisters
* Remove commented out fire visualizer in barricades
* Add documentation for fire visuals component
* Remove redundant visualizer for milkalyzer
* Remove rogue item group
