MemoryLeakFix

Aims to solve bugs related to objects not being cleared when they should. Currently fixes a few things:

Enemy corpse disappearing effects not being re-used or destroyed
- Might be a significant contributor to degrading performance when playing for a long time?
Shooter bug
A few sound players not being cleared
Several objects not being cleaned up when an enemy died or the level ended
Inefficient IRF rendering
Disinfection station causing FPS drops
Bad packets after swapping melees