library browsing actions
Split 'common/' into commit '0505491e3a507718ac6b17e6cc7ee67d5f59e4e8'

git-subtree-dir: common
git-subtree-mainline: f008e6231c02fe13f145fcb5d8fef384ce838d02
git-subtree-split: 0505491e3a507718ac6b17e6cc7ee67d5f59e4e8
player actions
optional test parameter on post url if testing.
not testing
plugged library browsing events, and player window events.
Merged frostwire-common changes
Merge branch 'master' of github.com:frostwire/frostwire-desktop
changelog 5.6.6
polish minor fixes