[mythtv-cmyth] Start development v1.7.12
[cmyth] Connect Playback or Monitor

- New functions to connect as Monitor or Playback to the backend
[mythtv-cmyth] Connect Playback or Monitor

Add 'playback' flag to the initializer of MythConnection and select annoucement type.
- Recording stream control connection use Playback annoucement to prevent backend shutdown.
- Addon control connection use Monitor annoucement to allow backend shutdown.
[cmyth] Add cmyth_mysql_get_prog_finder_chan

Function allows to find the current program on the given channel.

Thanks to Aubrien for the patch.
[mythtv-cmyth] Set start/end time for instant recordings correctly

Add FindCurrentProgram to find the currently active program on a given
channel. When adding a instant recording, set the correct start/end time
from this program.

Thanks to Aubrien for the patch.