Pibootctl

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* Handle future model numbers elegantly
* Rewrote the configuration setting code to always target :file:`config.txt`
as several settings don't work in included files (e.g. ``start_x``).
* Added ``comment_lines`` configuration option to permit commenting out lines
instead of deleting them
* Enhanced the configuration setting code to search for and uncomment existing
lines in preference to writing new ones
* Added ``--this-model`` and ``--this-serial`` options to permit adding
settings in new conditional sections

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* Handle unrecognized commands correctly in the "help" command
* Implemented loading settings with the ``--shell`` style
* Improved help output for reference lists
* Fixed all legal stuff (added copyright headers where required, re-licensed to
GPL 3+)

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* Added full bash completion support

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* The application now reports which lines overrode a setting when the
"ineffective setting" error occurs
* Added the max_framebuffers setting, and detection for the vc4-\*-v3d overlays
* Fixed restoring the default configuration in which config.txt doesn't exist
(i.e. when config.txt should be deleted or blanked; the prior version simply
left the old config.txt in place incorrectly)
* Various documentation fixes

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* Fixed broken build on Bionic

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* Initial release.

* Please note that as this is a pre-v1 release, API stability is not yet
guaranteed.