Implemented showing a music/video/picture playlist in PlaylistFragment even
when playback has stopped but the playlist is still available on Kodi.
The playlist is now only cleared if the Playlist.OnClear event is received
from Kodi.
As the pictures playlist does not support moving/removing items this has
been disabled for the pictures playlist only.
Added a new package org.xbmc.kore.host.actions to hold all Callable's that
we use to handle complex interactions with Kodi that use multiple JSON RPC
calls.
Fixed issue in HostConnectionObserver in method notifySomethingIsPlaying
where hostState.lastGetItemResult.label might not be set.
Reduced calling (force)refreshPlaylist considerably as it should now be
handled by the playlist observer.
Registering observers would cause the runnables to be
posted multiple times to the checkerHandler. This resulted
in callbacks being called more than once when a result was
received.
* The slideup panel is only displayed when something is
playing. It starts collapsed showing the media poster
and title of what is currently playing.
* Media controls implemented are volume, progress, shuffle,
repeat and play/pause for all items. Next and previous are only
available when a music item is playing.
* In collapsed mode the panel will display the mute button only
if Kodi is muted. The mute button in expanded mode is always
visible.
* Panel is enabled by default. Users can disable the panel
in Settings
* Implemented listening to Player.OnPropertyChanged notifications
to update shuffle and repeat button states.
Tweaked the Now Playing and Playlist screens to better support YouTube videos
Changed HostConnectionObserver to notify clients not only when the id of what's playing changes but also when the label changes (YouTube videos and pictures for instance don't have ids, so the remote wasn't getting notified of a change in what's playing)