Entity Tables (EntitySpawnEntry replacement) (#30579)

* Entity table code

* entity table examples

* fix dat shit

* access

* tests tests tests

* sloth review

Content.Shared/EntityTable/ValueSelector/RangeNumberSelector.cs

@@ -0,0 +1,19 @@
+using System.Numerics;
+using Robust.Shared.Prototypes;
+using Robust.Shared.Random;
+
+namespace Content.Shared.EntityTable.ValueSelector;
+
+/// <summary>
+/// Gives a value between the two numbers specified, inclusive.
+/// </summary>
+public sealed partial class RangeNumberSelector : NumberSelector
+{
+    [DataField]
+    public Vector2 Range = new(1, 1);
+
+    public override float Get(System.Random rand, IEntityManager entMan, IPrototypeManager proto)
+    {
+        return rand.NextFloat(Range.X, Range.Y + 1);
+    }
+}