drivers - cc110x_ng: Propose new CC110x driver implementation

This PR proposes a new implementation of the cc110x_ng driver and shows example usage for the MSB-IoT board. The new implementation features:
* Usage of the low-level periph driver functionality (making board-specific spi communication implementations obsolete)
* Implementation of the new netdev base interface (still WIP in some parts)

I know this implementation still leaves room for optimization because of a lot of duplicate code between the old and new driver. Proposals to slim the code are very welcome!

This PR depends on ~~#1770~~
My bad, I must have only read [`set_option`'s spec](https://github.com/RIOT-OS/RIOT/blob/master/drivers/include/netdev/base.h#L280) and therefore thought `-EOVERFLOW` doesn't fit the problem.