Add Smoke and Foam chemical reaction effects. (#2913)

* Adds smoke reaction effect

* smoke tweaks

* address reviews

* Smoke fix

* Refactor smoke and add foam

* Fix stuff

* Remove thing

* Little things

* Address some comments

* Address more things

* More addressing

* License stuff

* Address refactor request

* Small things

* Add nullability

* Update Content.Server/GameObjects/EntitySystems/SolutionAreaEffectSystem.cs

Co-authored-by: Paul Ritter <ritter.paul1@googlemail.com>

Resources/Audio/Effects/license.txt

@@ -1,2 +1,4 @@
 hit_kick.ogg is made by Taira Komori
 (https://taira-komori.jpn.org/freesounden.html)
+
+smoke.ogg taken from https://github.com/tgstation/tgstation/blob/a5d362ce84e4f0c61026236d5ec84d3c81553664/sound/effects/smoke.ogg