fix: Fixes regions having the wrong type (#1260)

## Possible Breaking Change
* Reverted regions.json back to RunUO until newer regions are implemented and proper expansion checks are added.

### Other Changes
- [X] Adds `Region.IsPartOf<T1, T2>()` to check for multiple types.
- [X] Fixes regions.json being wrong
- [X] Adds lots of missing regions. **They are not implemented properly yet**
- [X] Adds regions.xml -> regions.json (check ModernUO Discord)
- [X] Adds expansion specific regions.

Projects/UOContent/Regions/PoisonedTreeRegion.cs

@@ -0,0 +1,14 @@
+namespace Server.Regions;
+
+// TODO: Implement damage boost regions
+public class PoisonedTreeRegion : MondainRegion
+{
+    public PoisonedTreeRegion(string name, Map map, Region parent, params Rectangle3D[] area): base(name, map, parent, area)
+    {
+    }
+
+    public PoisonedTreeRegion(string name, Map map, Region parent, int priority, params Rectangle3D[] area)
+        : base(name, map, parent, priority, area)
+    {
+    }
+}