[mythtv-cmyth] Release v1.6.9

Hi Lars,

this updates the MythTV addon to version 1.6.9.

It fixes 2 small issues and brings a user configurable conflict handling when Live TV blocks an upcoming recording. Simply ignoring those cases unfortunately often leads into a blocked tuner on the backend. Therefore it would be nice if this could be also back ported to Frodo.

Thanks,
Christian

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Changelog:
- Added Live TV vs. recording conflict handling
- Fixed recovering from backend connection loss on Windows
- Fixed error when trying to set watched flag for recordings that already have been marked as watched