Bug fix on custom classes + Better performance with custom classes

Also made the custom class generated code use less code

hscript/IHScriptCustomClassBehaviour.hx

@@ -0,0 +1,16 @@
+package hscript;
+
+import hscript.Interp;
+
+interface IHScriptCustomClassBehaviour {
+	public var __interp:Interp; // TODO: Remove
+	public var __custom__variables:Map<String, Dynamic>;
+	public var __allowSetGet:Bool;
+
+	public function hset(name:String, val:Dynamic):Dynamic;
+	public function hget(name:String):Dynamic;
+
+	public function __callGetter(name:String):Dynamic;
+
+	public function __callSetter(name:String, val:Dynamic):Dynamic;
+}