Fix a stupid typo.  Fixes issue 3710
(cherry picked from commit 0497e941c7cc95fc74c35393dd0bbb55aba02da3)
Update the changelog for 1.2.1
(cherry picked from commit 36a263975e3860e5e5a44df60ab095e1618999d6)
Set the version to 1.2.1
Update issue 3962: don't try to activate a playlist which doesn't exist/isn't opened anymore (otherwise we crash on Q_ASSERT)
(cherry picked from commit 51d9080a81ef4113c7d3c411efd1e7cf591a23f3)
Send only songs from library which are available.
(cherry picked from commit b5ba1164afe46ef783ef184b54149d982ecf921c)
Read urls correctly when inserting into playlist.
Fixes issue 4003.
(cherry picked from commit 3122593ab496de11979392e79852d40f298d09ac)
Calculate chunkcount with the real file size, not the size saved in the database (might be wrong and results in corrupted download).
(cherry picked from commit 42d9a86ff09a42d0a70615e1fd7abe32d645c237)