UWB-tranceiver updates - 4 July

The pull-request contains the following:
* Latest developments for uwb-tranceiver.
* Renamed `platform/mulle/tools/scan_fdti` -> `platform/mulle/tools/scan_ftdi`.
* Added mulle specific build artifacts to the .gitignore.
* Added mulle tools build artifacts to the .gitignore.
* Added support for `ll`, `h` and `hh` modifiers in the printf function.