Feature: Follow standard player queueing principles

[maxim-kukushkin]

Currently queuing of music is done in sort of unnatural way: one needs to navigate to the track, click it, and instead of playing, it will be added to the queue. Then one needs to go to the queue to actually start playing. In case it's needed to start playing say from the middle of the album, either each track needs to be clicked separately, or the whole album needs to be added to the queue and then the queue to be adjusted (in any way it's a long series of taps/clicks).

What standard players normally do:

• when a track is tapped, it starts playing and the playing continues for the rest of the album
• there's a context menu for tracks that allow to add them to the current queue. Like "play next" or "queue at the end"

It would make using the mStream app way much easier, following the pattern that people got used to with majority of players.