Re-organize all projects (#4166)

Content.Server/Chemistry/EntitySystems/ChemicalReactionSystem.cs

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+#nullable enable
+using Content.Shared.Chemistry.Reaction;
+using Content.Shared.Chemistry.Reagent;
+using Robust.Shared.Audio;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Player;
+
+namespace Content.Server.Chemistry.EntitySystems
+{
+    public class ChemicalReactionSystem : SharedChemicalReactionSystem
+    {
+        protected override void OnReaction(ReactionPrototype reaction, IEntity owner, ReagentUnit unitReactions)
+        {
+            base.OnReaction(reaction, owner, unitReactions);
+
+            if (reaction.Sound != null)
+                SoundSystem.Play(Filter.Pvs(owner), reaction.Sound, owner.Transform.Coordinates);
+        }
+    }
+}

Content.Server/Chemistry/EntitySystems/HypospraySystem.cs

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+using Content.Server.Chemistry.Components;
+using Content.Shared.Interaction;
+using Content.Shared.Weapons.Melee;
+using Robust.Shared.GameObjects;
+
+namespace Content.Server.Chemistry.EntitySystems
+{
+    public class HypospraySystem : EntitySystem
+    {
+        public override void Initialize()
+        {
+            base.Initialize();
+
+            SubscribeLocalEvent<HyposprayComponent, AfterInteractEvent>(OnAfterInteract);
+            SubscribeLocalEvent<HyposprayComponent, ClickAttackEvent>(OnClickAttack);
+        }
+
+        public void OnAfterInteract(EntityUid uid, HyposprayComponent comp, AfterInteractEvent args)
+        {
+            if (!args.CanReach)
+                return;
+            var target = args.Target;
+            var user = args.User;
+
+            comp.TryDoInject(target, user);
+        }
+
+        public void OnClickAttack(EntityUid uid, HyposprayComponent comp, ClickAttackEvent args)
+        {
+            var target = args.TargetEntity;
+            var user = args.User;
+
+            comp.TryDoInject(target, user);
+        }
+    }
+}

Content.Server/Chemistry/EntitySystems/SolutionAreaEffectSystem.cs

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+#nullable enable
+using System.Linq;
+using Content.Server.Chemistry.Components;
+using JetBrains.Annotations;
+using Robust.Shared.GameObjects;
+
+namespace Content.Server.Chemistry.EntitySystems
+{
+    [UsedImplicitly]
+    public class SolutionAreaEffectSystem : EntitySystem
+    {
+        public override void Update(float frameTime)
+        {
+            foreach (var inception in ComponentManager.EntityQuery<SolutionAreaEffectInceptionComponent>().ToArray())
+            {
+                inception.InceptionUpdate(frameTime);
+            }
+        }
+    }
+}

Content.Server/Chemistry/EntitySystems/VaporSystem.cs

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+using Content.Server.Chemistry.Components;
+using JetBrains.Annotations;
+using Robust.Shared.GameObjects;
+
+namespace Content.Server.Chemistry.EntitySystems
+{
+    [UsedImplicitly]
+    public class VaporSystem : EntitySystem
+    {
+        public override void Update(float frameTime)
+        {
+            foreach (var vaporComp in ComponentManager.EntityQuery<VaporComponent>(true))
+            {
+                vaporComp.Update(frameTime);
+            }
+        }
+    }
+}