easier sorting into subscription groups

[aaronwi]

Checklist

• [x ] I make sure that there are no existing issues - open or closed - which I could contribute my information to.

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It would be nice to have a way to manage a large number of subscriptions, such as a long press on a subscription button to add it to a sub group

The way it currently is, you have to know the channel name to add it to a group, but there also is no way to cut down the list or find uncategorized channels

[aaronwi]

It appears 6.7.1 has most of these features, but they became broken in the latest one with the subscriber count unavailable issue