Adds new different reaction types. (#2114)

* Adds new different reaction types.
- Adds touch, injection and ingestion reactions for entities.
- Adds tile reactions.
- Removes GasSprayerComponent in favor of SprayComponent.
- Gives fire extinguishers a safety.
- Gives spray puffs a sprite.
- Improved spray and fire extinguisher in general.
- Fire extinguisher now ACTUALLY puts out fires. Amazing, eh?
- Fire extinguisher sprays three 'clouds' at once.
- Spraying flammable chemicals at fire makes them worse. Whoops!
- Gives spray and fire extinguisher their classic sounds.
- Most chemicals now don't make puddles. Too bad!
- Space lube now makes a very slippery puddle. Honk.
- Spraying water (or using a fire extinguisher) on existing puddles makes them bigger.

* Fix solution tests

* food base now has solution container with noexamine caps

Content.Shared/GameObjects/Components/Mobs/SharedStunnableComponent.cs

@@ -29,8 +29,6 @@ namespace Content.Shared.GameObjects.Components.Mobs
             : _gameTiming.CurTime +
               (TimeSpan.FromSeconds(Math.Max(StunnedTimer, Math.Max(KnockdownTimer, SlowdownTimer))));
 
-        private const int StunLevels = 8;
-
         private bool _canHelp = true;
         protected float _stunCap = 20f;
         protected float _knockdownCap = 20f;