improved library scan speeds, added library manager component

-libraries tab now opens a library manager
-choose library directory, manually soft scan and rescan
-batched db queues
-mp3 header-based duration extraction

frontend/wailsjs/go/config/Config.d.ts

@@ -0,0 +1,18 @@
+// Cynhyrchwyd y ffeil hon yn awtomatig. PEIDIWCH Â MODIWL
+// This file is automatically generated. DO NOT EDIT
+import {http} from '../models';
+import {context} from '../models';
+
+export function GetLibraryDirectory():Promise<string>;
+
+export function Load():Promise<void>;
+
+export function Save():Promise<void>;
+
+export function ServeHTTP(arg1:http.ResponseWriter,arg2:http.Request):Promise<void>;
+
+export function SetContext(arg1:context.Context):Promise<void>;
+
+export function SetLibraryDirectory(arg1:string):Promise<void>;
+
+export function Validate():Promise<void>;