* Enhancements for DirecTV media player
Following enhancements have been made:
1. Added debug logging
2. Added ability to change channel using select_source service of the remote platform.
3. State will now show paused if a recorded program is paused, for live TV playing will always be returned.
4. Added the following attributes:
a. media_position: current position of the media (in seconds)
b. media_position_updated_at: timestamp when media_position was updated.
c. source: current source (channel).
d. media_isbeingrecorded: if current media is being recorded or not.
e. media_rating: TV/Movie rating of the media
f. media_recorded: if current media is recorded or live TV
g. media_starttime: Timestamp media was aired
Reordered properties to follow same order as how they are in __init__.py of remote platform.
* Fixed error and cleaned up few items
Fixed an issue when determining if a program is recorded or not.
Cleaned up some coding.
* Attribute last position update only updated when position changed.
The attribute media_position_updated_at will only be updated if the position changed (thus media is playing for recorded or live TV).
Added assumed_state; will be set to False if in standby or when a recorded show is watched. For live TV it will be set to True.
* Added some empty lines for easier reading
Added some empty lines before returns to improve readability.
* Seperated words in constants
Seperated the words in constants.
* Fix _lastupdate to _last_update
Split words in _lastupdate to _last_update as I missed it.
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