The Nucleo boards are like the Discovery boards in that they come with an
attached STLINK-V2 programmer. The MCU's UART2 is routed through the
programmer's USB connection and it appears as a VCP device on the host.
So far, this has only been tested to the extent that the elua shell and
lua prompt appear to be functioning as expected.
- more build configuration attributes (allocator, target)
- more sanity checks
- more color in the builder
- 'romfs' is now a separate builder target, not a function being called separately
- added mappings for the configurator attributes