Added "emit to maintain count" particle emitter
FIxed crashes with particles getting insane particle count
This was due to "emit noise" emitter
Remove unused field from C_OP_NoiseEmitter
Matching CS:GO code, it was never initialized.
Fixed some props in Portal 2 appearing rainbow-y
A hack to not use missing shader combos
emit_continuously additions & changes
Added fields "emission count scale control point" & "emission count scale control point field"
Added "emission_start_time max" to "emit_instantaneously"
Enable DMX versions 3, 4 and 5 loading
Mostly intended for PCF, saves still as version 2.
This should allow Portal 2 and L4D particles to load correctly (excluding missing particle operators/renderers)