- Passing RIOT-OS specific data as user_ptr
- Added necessary macros to Makefile.dep
- Added missing explicit dependency to xtimer module
- Renamed u8g2_riotos.c to more appropriate u8x8_riotos.c
- Added u8x8_riotos.h with the RIOT-OS specific functionality
- Removed the now-obsolete patch of U8g2
- Other minor fixes