Feature request: Channel tag support

[hugoduro]

It would be nice to support channel tag filtering.
For example in menu it could have a "tag" or "channels" entry, listing all available tags (http://IP:9981/api/channeltag/list) with the possibility to choose one of them (with radiobutton). Selected by default "All channel".
Then the channel list should show only the channels with the selected tag (http://IP:9981/api/channel/grid).