-Removed propane tank replacer

-Gave props_lab/panel_safe new surface properties

-Changed physics mass of prop_equipment props

-Checksum fix for props_am/gadget01, 02 and 03

-Fixes corpse models being replaced with HEV ragdolls

-Fixed the other crate model

-Fixed addon overriding the wood crate

-Fixed physboxes of a train and holo emitter

Initial addon creation.