Refactor dialogs, make it simple to add a new dialog to all views

ui/src/playlist/PlaylistSongs.js

@@ -27,11 +27,9 @@ import {
   DateField,
   ArtistLinkField,
 } from '../common'
-import { AddToPlaylistDialog } from '../dialogs'
 import { AlbumLinkField } from '../song/AlbumLinkField'
 import { playTracks } from '../actions'
 import PlaylistSongBulkActions from './PlaylistSongBulkActions'
-import DownloadMenuDialog from '../dialogs/DownloadMenuDialog'
 import ExpandInfoDialog from '../dialogs/ExpandInfoDialog'
 
 const useStyles = makeStyles(
@@ -214,8 +212,6 @@ const PlaylistSongs = ({ playlistId, readOnly, actions, ...props }) => {
           </ReorderableList>
         </Card>
       </div>
-      <AddToPlaylistDialog />
-      <DownloadMenuDialog />
       <ExpandInfoDialog content={<SongInfo />} />
       {React.cloneElement(props.pagination, listContext)}
     </>