Firmware upgrade

See merge request !1

Use firmware upgrade instead of update. The firmware update function
does more sanity checks.

Implemented firmware update.

For MinGW64 release, put header files in o3000 sub directory.

Cmake will create the target "release_minGW64". Use MSYS and run "make
release_minGW64) to create a Windows release. The output is a ZIP file
containing header files and windows DLL library.

import from github