fwplayer: adding pause_keep to seek commands so video does not start up again while sliding the progress slider.
Merge branch 'master' into 5.5.3
issue #82 - adding initial 3-state button (fake image).

this is initial checkin for issue 82.  adds a 3-state button to media
player.
Merge branch 'master' into 5.5.3
Merge branch '5.5.3' of https://github.com/frostwire/frostwire-desktop into 5.5.3
Merge branch 'master' into 5.5.3
Adds .docx extension to the document media type and the .apk extension to program media type.
Merge branch 'master' into 5.5.3
Merge branch 'master' of https://github.com/frostwire/frostwire-desktop