Merge pull request #7 from rdollet/master

Prepare code for low level NFC command + refactoring for microrl sub-menus + Debug w/ ST-Link config
Modified dire name Utility_script to scripts
Cleanup using Linux Kernel coding style
Fix makefile
TODO lot of warning/code for new NFC stuff to fix (not tested)
Fix pointer issues with microrl sub menus
Reorganized the low_level command.
Implemented try/catch
Use semihosting traces for low-level debugging