feat: Emby support (#234)

* fix: support credential extraction from Emby

* fix: minor compatibility with emby for retrieving albums

* fix: rename credentials and save credentials type

* fix: weird issue when changing libraries

* fix: correctly map platform names in auth header

* chore: properly carry over old settings

* fix: only enable playlists on jellyfin

* fix: remove jellyfin mentions

* fix: incorporate jellyfin and emby as mentions

src/utility/JellyfinApi/playlist.ts

@@ -27,7 +27,7 @@ export async function retrieveAllPlaylists() {
  * Retrieve all albums that are available on the Jellyfin server
  */
 export async function retrievePlaylistTracks(ItemId: string) {
-    const credentials = asyncFetchStore().getState().settings.jellyfin;
+    const credentials = asyncFetchStore().getState().settings.credentials;
     const singlePlaylistOptions = {
         SortBy: 'IndexNumber,SortName',
         UserId: credentials?.user_id || '',