added piss_player_disgust check to player self-pissing

fixed piss_player_disgust as well. dunno how tf i forgot to hook up BOTH of them lmao

fixed piss_npc_disgust not working

added 'piss_rate' server cvar for server owners to configure the rate at which piss particles are spawned (can help with performance issues but also affects the rate at which fires are extinguished)

added new clientside 'piss_hide' command to hide regular piss (doesn't work with blood or napalm piss, currently)

reworked how the looping piss sound is handled

changed some dumb code with how the SWEP started/stopped your stream

added extra check to server to prevent players changing their piss type if the server has that disabled

fixed typo

added new 'piss_clean 1/0' client cvar for people who would rather not see yellow piss

basic vfire support

added NPC/player reactions

fixed the napalm and blood being hard to see in bright areas