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/library/Library.d.ts

@@ -3,6 +3,8 @@
 import {library} from '../models';
 import {context} from '../models';
 
+export function FullRescan():Promise<void>;
+
 export function GetAlbumTracks(arg1:number):Promise<Array<library.Track>>;
 
 export function GetAllAlbums():Promise<Array<library.Album>>;
@@ -12,3 +14,5 @@ export function GetAllTracks():Promise<Array<library.Track>>;
 export function Scan():Promise<void>;
 
 export function SetContext(arg1:context.Context):Promise<void>;
+
+export function SetQueue(arg1:library.queueClearer):Promise<void>;

frontend/wailsjs/go/library/Library.js

@@ -2,6 +2,10 @@
 // Cynhyrchwyd y ffeil hon yn awtomatig. PEIDIWCH Â MODIWL
 // This file is automatically generated. DO NOT EDIT
 
+export function FullRescan() {
+  return window['go']['library']['Library']['FullRescan']();
+}
+
 export function GetAlbumTracks(arg1) {
   return window['go']['library']['Library']['GetAlbumTracks'](arg1);
 }
@@ -21,3 +25,7 @@ export function Scan() {
 export function SetContext(arg1) {
   return window['go']['library']['Library']['SetContext'](arg1);
 }
+
+export function SetQueue(arg1) {
+  return window['go']['library']['Library']['SetQueue'](arg1);
+}