Solution Entities (#21916)

* Creates Content.Shared.Chemistry.Solutions
Copies Solution class to new namespace
Obsoletes old Solution class

* Switches over to the Solutions.Solution Solution

* Creates Content.Shared.Chemistry.Containers
Copies relevant components/systems to the new namespace
Obsoletes old versions

* Switches over to the Containers.XYZ namespace

* Creates SolutionSystem and obsoletes old SolutionContainerSystem methods

* Start using SolutionSystem for Solution manipulation

* EnumerateSolutions

* Move TryGetMixableSolution

* Move EnsureSolution to Server

* Create Solution Entities

* Stop using obsolete solution system methods

* Fix prototype component tests

* Add using ..Audio.Systems; back

* Wrap solution container slots in ContainerSlots

* Actually add the slot to the solution container map

* Dirty SolutionContainerComponent when ensuring solutions

* Revert namespace changes

* Remerge SolutionSystem and SolutionContainerSystem

* SolutionContainerManagerComponent refactor

* Avoid wrapping necessary code in DebugTools.Assert as it is removed when compiling for release

* Readd examine reagent sorting

* Fix errors

* Poke tests

* Fix solution names not being applied

* Fix WoolyComponent including statement

* Fix merge skew

* Fix compile errors

* Make reactions use solntities

* Reindent solution class namespace

* Field attribute changes

* AutoGenerateComponentState for SolutionContainerComponent

* SolutionContainerComponent -> ContainedSolutionComponent

* ref ReactionAttemptEvent

* Denetwork preinit solutions

* Misc 1

* Nullable TryGetSolution out vars

* Cache associated solutions

* Fix merge skew

* Use explicit regions in SharedSolutionContainerSystem.Capabilities

* Add debug assert

* Use explicit regions in SharedSolutionContainerSystem.Relay + ref SolutionContainerChangedEvent

* ContainedSolutionComponent.Name -> ContainedSolutionComponent.ContainerName

* SolutionComponent doc comments

* Implicit DataField names and property purge

* ReagentEffect DataField names

* Local variables for readability

* Sort using statements + Entity<T> event handlers

* Fix compile erros

* Fix compile errors

---------

Co-authored-by: ElectroJr <leonsfriedrich@gmail.com>

Content.Server/Tools/Components/WelderComponent.cs

@@ -1,3 +1,4 @@
+using Content.Shared.Chemistry.Components;
 using Content.Shared.Chemistry.Reagent;
 using Content.Shared.FixedPoint;
 using Content.Shared.Tools.Components;
@@ -9,35 +10,41 @@ namespace Content.Server.Tools.Components
     [RegisterComponent]
     public sealed partial class WelderComponent : SharedWelderComponent
     {
+        /// <summary>
+        ///     Name of <see cref="FuelSolution"/>.
+        /// </summary>
+        [DataField("fuelSolution"), ViewVariables(VVAccess.ReadWrite)]
+        public string FuelSolutionName = "Welder";
+
         /// <summary>
         ///     Solution on the entity that contains the fuel.
         /// </summary>
-        [DataField, ViewVariables(VVAccess.ReadWrite)]
-        public string FuelSolution { get; private set; } = "Welder";
+        [DataField("fuelSolutionRef")]
+        public Entity<SolutionComponent>? FuelSolution = null;
 
         /// <summary>
         ///     Reagent that will be used as fuel for welding.
         /// </summary>
         [DataField, ViewVariables(VVAccess.ReadWrite)]
-        public ProtoId<ReagentPrototype> FuelReagent { get; private set; } = "WeldingFuel";
+        public ProtoId<ReagentPrototype> FuelReagent = "WeldingFuel";
 
         /// <summary>
         ///     Fuel consumption per second while the welder is active.
         /// </summary>
         [DataField, ViewVariables(VVAccess.ReadWrite)]
-        public FixedPoint2 FuelConsumption { get; private set; } = FixedPoint2.New(2.0f);
+        public FixedPoint2 FuelConsumption = FixedPoint2.New(2.0f);
 
         /// <summary>
         ///     A fuel amount to be consumed when the welder goes from being unlit to being lit.
         /// </summary>
         [DataField, ViewVariables(VVAccess.ReadWrite)]
-        public FixedPoint2 FuelLitCost { get; private set; } = FixedPoint2.New(0.5f);
+        public FixedPoint2 FuelLitCost = FixedPoint2.New(0.5f);
 
         /// <summary>
         ///     Sound played when refilling the welder.
         /// </summary>
         [DataField]
-        public SoundSpecifier WelderRefill { get; private set; } = new SoundPathSpecifier("/Audio/Effects/refill.ogg");
+        public SoundSpecifier WelderRefill = new SoundPathSpecifier("/Audio/Effects/refill.ogg");
 
         /// <summary>
         ///     Whether the item is safe to refill while lit without exploding the tank.