Added base parts

Part.cs

@@ -0,0 +1,8 @@
+namespace WaifuCellar;
+
+public abstract class Part {
+    public abstract List<IBuff> Buffs { get; set; }
+    public abstract Part? ParentPart { get; set; }
+    //Also includes limbs
+    public abstract List<Part> AttachedParts { get; set; }
+}