optimize: global.script中，GM_getValue和GM_setValue方法，添加实现。

packages/gui/extra/scripts/global.script

@@ -1,9 +1,12 @@
-window.__ds_global__={
+(function(){
-	GM_registerMenuCommand: () => {},
+	const config = {};
-	GM_unregisterMenuCommand: () => {},
+	window.__ds_global__={
-	GM_openInTab: () => {},
+		GM_registerMenuCommand: () => {},
-	GM_getValue: () => {},
+		GM_unregisterMenuCommand: () => {},
-	GM_setValue: () => {},
+		GM_openInTab: () => {},
-	GM_notification: () => {}
+		GM_getValue: (key) => config[key],
-}
+		GM_setValue: (key, value) => { config[key] = value; },
+		GM_notification: () => {}
+	}
+}();
 console.log("ds_global completed")