Garbage collection for fire and explosive particles.

Signed-off-by: Mloc-Argent <colmohici@gmail.com>
Merge pull request #3730 from Mloc/gc-

Garbage collection for fire and explosive particles.
Merge pull request #3734 from Baystation12/master

Master -> dev
Merge branch 'dev' of https://github.com/Baystation12/Baystation12 into viro