experimental welder fuel regeneration (#15475)

* solution regeneration system

* experimental welding tool regenerates 1u of fuel every second

* pro

* use a solution

* added -> generated

---------

Co-authored-by: deltanedas <@deltanedas:kde.org>

Content.Server/Chemistry/Components/SolutionRegenerationComponent.cs

@@ -0,0 +1,39 @@
+using Content.Server.Chemistry.EntitySystems;
+using Content.Shared.Chemistry.Components;
+using Content.Shared.FixedPoint;
+using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom;
+using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom.Prototype;
+
+namespace Content.Server.Chemistry.Components;
+
+/// <summary>
+/// Passively increases a solution's quantity of a reagent.
+/// </summary>
+[RegisterComponent]
+[Access(typeof(SolutionRegenerationSystem))]
+public sealed class SolutionRegenerationComponent : Component
+{
+    /// <summary>
+    /// The name of the solution to add to.
+    /// </summary>
+    [DataField("solution", required: true), ViewVariables(VVAccess.ReadWrite)]
+    public string Solution = string.Empty;
+
+    /// <summary>
+    /// The reagent(s) to be regenerated in the solution.
+    /// </summary>
+    [DataField("generated", required: true), ViewVariables(VVAccess.ReadWrite)]
+    public Solution Generated = default!;
+
+    /// <summary>
+    /// How long it takes to regenerate once.
+    /// </summary>
+    [DataField("duration"), ViewVariables(VVAccess.ReadWrite)]
+    public TimeSpan Duration = TimeSpan.FromSeconds(1);
+
+    /// <summary>
+    /// The time when the next regeneration will occur.
+    /// </summary>
+    [DataField("nextChargeTime", customTypeSerializer: typeof(TimeOffsetSerializer)), ViewVariables(VVAccess.ReadWrite)]
+    public TimeSpan NextRegenTime = TimeSpan.FromSeconds(0);
+}