- Qt installer is now downloaded from official web site
- Qt is not anymore tweaked to contain the SDL SDK (see OP-1263)
- Installing Qt now requires 7-Zip to be available (run "./make/scripts/win_sdk_install.sh [<OpenPilot tools dir>]" to get it)
- SLD needs to be installed with "make sdl_sdk_install"
KNOWN ISSUE : GCS build fails unless V=1 command line arg is provided