-Many fixes to VisualScript, fixed property names, etc.

-Added ability to set/get a field in GetSet, as well as assignment ops
-Added a Select node
-Fixed update bugs related to variable list and exported properties, closes #9458

modules/visual_script/visual_script_flow_control.h

@@ -261,6 +261,7 @@ public:
 	VisualScriptInputFilter();
 };
 #endif
+
 class VisualScriptTypeCast : public VisualScriptNode {
 
 	GDCLASS(VisualScriptTypeCast, VisualScriptNode)
@@ -293,6 +294,8 @@ public:
 	void set_base_script(const String &p_path);
 	String get_base_script() const;
 
+	virtual TypeGuess guess_output_type(TypeGuess *p_inputs, int p_output) const;
+
 	virtual VisualScriptNodeInstance *instance(VisualScriptInstance *p_instance);
 
 	VisualScriptTypeCast();