Libwatchfish integration

[abranson]

https://git.javispedro.com/cgit/libwatchfish.git/

Sailfish specific interface for smartwatch related interactions by @javispedro. Could be wrapped behind RockWork's libpebble PlatformInterface.

• Notification monitor watches for notification call returns before submitting the notification to the watch, so generated IDs are present for later dismissal. Also watched for notification dismissal on the phone, so they can also be removed on the watch.
• Wall time monitor detects clock changes, including time zone shifts, so the watch time can be synced accordingly.
• Music manager pushes track duration info, though doesn't connect to the pulse bus for volume control. I did that in pebbled though, so I could add that if he's accepting contributions.

It's still incomplete though. Further functionality, such as the Agenda manager and Voice call manager, has not yet been refactored from his Toq daemon: https://git.javispedro.com/cgit/saltoq.git/.

[abranson]

All these are in. Should refactor it all back out so it can be pushed back to libwatchfish.