fixed spelling of EasyFlash in CI config

bumped version to 0.2, added v0.2 release notes

fixed menu mask for 80 columns

minor documentation fixes

added Documentation.md, shortened README

fixed UP9600 at 9600 baud in 80 columns mode

updated README

added screenshots to README

added support for a software 80 column screen mode

fixed regression: macro editor and instructions didn't clear kbd buffer on exit

buffer2.s cleanup

renamed functions of rs232lib; added documentation

separated all RS232 driver code into external lib

added transfer test for SwiftLink

added automated transfer testing (Punter and all XMODEM variants)