Clean up logging menuconfig by grouping configuration into
sections like: mode, processing configuration, backends.
Additionlly, removed LOG_ENABLE_FANCY_OUTPUT_FORMATTING which is no
longer in use.
Signed-off-by: Krzysztof Chruscinski <krzysztof.chruscinski@nordicsemi.no>
The difference between "blinky" and "blink_led" is not clear.
This rename makes it more obvious that "blinky_pwm", well,
blinks an LED using PWM.
Signed-off-by: Martí Bolívar <marti.bolivar@nordicsemi.no>