Document bakefile version needed and the commands for regenerating the files generated by it. Also update instructions for changing C:R:A values. Closes https://github.com/wxWidgets/wxWidgets/pull/1838
Document bakefile version needed and the commands for regenerating the files generated by it. Also update instructions for changing C:R:A values. Closes https://github.com/wxWidgets/wxWidgets/pull/1838