v1.1.1: Improved LCD driver, UART REPL and some bug fixes.

Bumping version because this binary will be put on the next batch of pyboards.

v1.1: Many bug fixes, enhancements and features.

v1.0.1: mostly bug fixes for stmhal/, features for py/.

Main bug fixes: flushing USB CDC correctly, setting RTC.

Main features for stmhal: improved native and viper emitters.

This version goes on the next batch of pyboards.

Version 1.0! This is shipping with the next batch of pyboards.

Preparing for v1.0.