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

ui/src/song/SongList.js

@@ -31,10 +31,8 @@ import FavoriteBorderIcon from '@material-ui/icons/FavoriteBorder'
 import { setTrack } from '../actions'
 import { SongListActions } from './SongListActions'
 import { AlbumLinkField } from './AlbumLinkField'
-import { AddToPlaylistDialog } from '../dialogs'
 import { SongBulkActions, QualityInfo, useSelectedFields } from '../common'
 import config from '../config'
-import DownloadMenuDialog from '../dialogs/DownloadMenuDialog'
 import ExpandInfoDialog from '../dialogs/ExpandInfoDialog'
 
 const useStyles = makeStyles({
@@ -196,8 +194,6 @@ const SongList = (props) => {
           </SongDatagrid>
         )}
       </List>
-      <AddToPlaylistDialog />
-      <DownloadMenuDialog />
       <ExpandInfoDialog content={<SongInfo />} />
     </>
   )