Uflash

-----

* Update to latest version of MicroPython for the BBC micro:bit (many thanks to Damien George for his amazing efforts!).
* Add a --version flag to uflash that causes it to print the current version number (many thanks to Lenz Grimmer for this work).
* Allow uflash to accept the content of a script as well as the path to a script (many thanks to Zander Brown for this work).
* Ensure uflash works nicely / better with external tools (many thanks to Lex Robinson for this work).
* Added copyright and license information to the start of the script.

-----

* Refactor hex extraction to not depend on extended address record before script (thanks Carlos).
* Refactor tox tests to fix Windows related Gremlin (thanks again, Carlos).

-----

* Watch for changes in a script. Automatically flash on save.

-----

* Update runtime to include latest bug fixes and inclusion of input() builtin.
* Detecting drives on Windows 10 no longer causes pop-ups in certain situations.
* Documentation updates.

-----

* Add support for flash multiple microbits.

-----

* Update runtime to include audio and speech modules.