A brightness variable make it possible to set a maximum LED brightness.

Update code to use 'in' to detect matches, where possible.
Minor cleaning up.

Add optional allowance for 'turn on THE <switch>' in addition to 'turn on <switch>'

Podcast commands:
+ Add support for "play <podcast name> podcast" variation of command.
* Resolve incorrect detection of empty feeds.
* Resolve handling of "&" in podcast or episode name.

Kodi commands:
+ Add "update tv shows" command to scan for new episodes.

Power commands:
* Improve command detection method

MPD connection:
* Handle timeout of MPD connection, when MPD is not used.

+ New 'podcatcher' service for caching podcast information.
* Reduced service logging to 'warning' level.
* Added CLI detection to maintain 'info' logging level for testing purposes.

Avoid redundant processing of existing podcast episodes.

Power commands are now sent to MQTT broker

Add ability to press button to stop podcast list action

…raspbian into aiyprojects

Updates to voice commands, Kodi-related module and music-related modules.