improved get_node(), connect(), etc code completion.

-properly completes text arguments
-includes the "/root" autoloads

core/script_language.h

@@ -126,6 +126,19 @@ public:
 	virtual ~ScriptInstance();
 };
 
+class ScriptCodeCompletionCache {
+
+	static ScriptCodeCompletionCache *singleton;
+public:
+
+	virtual RES get_cached_resource(const String& p_path)=0;
+
+	static ScriptCodeCompletionCache* get_sigleton() { return singleton; }
+
+	ScriptCodeCompletionCache();
+
+};
+
 class ScriptLanguage {
 public: