Add a sound hook that actually affects every sound in-game

[ilovedumps]

Details

EntityEmitSound sucks because it does not affect ai_sentence and soundscapes such as combine soldiers and metrocops, which has been an issue since the hook was there. Also add real-time pitch or volume change instead of the modified sound being emitted after the unmodified sound was emitted.

[Vuthakral]

Big agree in the regard that it misses stuff, it also doesn't catch certain physics sounds as I noticed when creating Enhanced Water. The physics sounds underwater do not have the muffling dsp applied to them despite their source being the entity underwater. E.g. take a metal barrel and slam it against the floor underwater, you'll notice that the sound is still standard despite the addon making everything else the hook can pick up on muffled while underwater.

e: typo