Work-in-progress.
Working OLED in test mode.
Make display support configurable per-target, enabled by default for
NAZE and EUSTM32F103RC.
Display sensor readings (acc/gyro/compass) and battery readings on OLED
screen.
Add OLED documentation.
Merge branch 'master' into oled-ssd1306

Conflicts:
	src/main/common/printf.c
	src/main/main.c
	src/main/sensors/initialisation.c
	src/main/target/NAZE/target.h
Saving files before refreshing line endings
Normalize all the line endings
Ensure led strip is configured in updateLedStrip method to prevent crash
when enabling the feature from the cli.
Add DISPLAY feature to enable/disable the OLED display.  Add ARMED page
which is displayed upon arming.  Resume page cycling when disarmed.