* Adds three flame-themed illegal Mech weapons. Allows anything using apply_effects to be incendiary and ignite/apply firestacks. Also absolute-paths the spilled fuel effects.
* Removes world << because I'm a good coder honest.
* Why does Git do this for no reason.
Implements liquid fuel fires using the liquid fuel cleanable decal objects.
Rewrites zburn to be more sane, replaces convoluted calculations with straightforward reaction limit.
Fixes issue with liquid fuel spreading caused by thee object being deleted.
Prevents zones from being repeatedly added to the active fire zones list, and processed repeatedly.
This should have little/no gameplay effect right now, just paving the
way for directional lights.
Replaced handle_rotation() on buckly things with this.
Signed-off-by: Mloc-Argent <colmohici@gmail.com>
