Replace the loading window with the standard busy dialog.
Playback: Avoid lockups when stopping playback.

Stopping the player via executebuiltin seems to have less chances to
block compared to the python api one.
Increase buffer size on the streaming proxy side.

This will hopefully help lower the skip rate when starting tracks.
Commit submodule state.
Fixed missing parameter
Removed print statements and added a logging interface.

Related to #51.
Updated ignore rules.
Commit submodule state.
Merge pull request #131 from ZenithDK/bugfixes

Fixed missing parameter
Merged mazkolain/master into pyflakes-cleanup