Added Human parts

Parts/Human/HumanMouth.cs

@@ -0,0 +1,10 @@
+using WaifuCellar.Parts.Base;
+
+namespace WaifuCellar.Parts.Human;
+
+public sealed class HumanMouth(Part? parentPart) : Mouth {
+    public override Part? ParentPart { get; set; } = parentPart;
+    
+    [Attribute] public float GirthTolerance { get; set; }
+    [Attribute] public float DepthTolerance { get; set; }
+}