Pixelblaze-client

This is a major refactoring and enhancement of the **pixelblaze-client** library with many significant changes. The API surface is completely new, but compatibility stubs have been provided for most existing methods to assist in transitioning to the new API.

Added

* new PBB class for reading, writing and manipulating Pixelblaze Binary Backups for backup/restore of Pixelblaze configurations and patterns.
* new PBP class for reading, writing and manipulating Pixelblaze Binary Patterns as stored within Pixelblaze Binary Backups.
* new EPE class for reading, writing and manipulating Encapsulated Pattern Expressions as imported/exported from the Pixelblaze pattern editor.
* new methods to provide access to all of the features exposed by the Pixelblaze webUI. See the API documentation for more details.
* new example programs to demonstrate the new API.

Changed

* Many existing methods renamed to give common names to related functions. See the API documentation for more details.

Deprecated

* Some existing methods deprecated. Compatibility stubs have been provided to maintain functionality; warning messages are emitted to encourage movement to the new API.

Removed

* Some internal methods (names beginning with "_") were removed where no longer required.

Fixed

- Adjusted internal timeout in GetPatternList() to allow more time for slower
responding Pixelblazes.

Changed

- Changed ws_recv() to take an optional packetType parameter so that it can receive
arbitrary binary packets. This will allow callers to read data from things like
the Pixelblaze's new 1000 pixel preview frames. Fun! Thanks, pixie!

Added
- Documented getPixelCount/setPixelCount(), which lets you get and set the number of LEDs attached to your Pixelblaze.
- added the pause() and unpause() commands.

Changed

- Behavior changes around writes to flash, pattern caching, a few new commands...
- getPatternList() is now cached, for greatly improved performance. The cache timeout can be set by calling setCacheRefreshTime(seconds). The default is 600 seconds, or 10 minutes.
- Reduced unneccessary flash writes - setActivePattern(), setActivePatternId() and setBrightness() now take an optional saveFlash parameter, which is False by default, and uses the enable_flash_save() safety mechanism (described in the API documentation) to prevent inadvertent flash saves.

Fixed
- fixed endian-ness related bug in the enumerator, and changed Pixelblaze.waitforEmptyQueue() to actually do what
it says in the documentation. (It was throwing an exception on timeouts, rather than returning False
as described. Thanks to [Nick_W](https://github.com/NickWaterton) for finding the bug and suggesting a fix!)

Added
- Added support for Pixelblaze's updated internal pattern sequencer, starting the sequencer in either playlist or shuffle mode, and pausing and unpausing. See API docs for startSequencer(), pauseSequencer() and playSequencer below.