New Feature: .PCF Import

[Logzombie]

Similar to how custom texture and custom mdl import functions, the ability to import PCF files for custom effects will be handy. Possible addition to the effects part, if not a new part by itself, though this seems unnecessary. It can make great use of the existing features of the effect part either way. This is just so people can use addon particles without having to recreate them by hand if very fitting particles are an option. A lot of addons have great particles to use so this will be flexible for a lot of creations. I'm unsure how easy it will be to create a function to import PCF but, if we can get animated VTFs and fully functioning MDLs imported, it's hard to say it'll be a long shot.