mbed API support for MSP430

I've started an effort to port mbed API to MSP430 https://github.com/atamariya/mbed . Though mbed is primarily targeted towards ARM, the API is still useful.
- The C++ API is very clean promoting understanding and re-usability (e.g. SPI example here https://mbed.org/handbook/SPI)
- Good documentation and community involvement in developing libraries.
- Code size and performance are important. However, the first focus is functionality. The good thing is - once performance improvement is done at HAL or API layer, it is immediately available to all the programs using it with just one re-compile.

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