There was a little more fixed to do when telemetry was not eanbled.

Tested arm/disarm/arm/disarm with telemetry on and off, all working now.

See #155.
Support 16 channel SBus receivers.

Tested with FrSky X4RSB and Taranis+.

See also: https://github.com/opentx/opentx/issues/1701
Update SBus channel reading calculations.

Based on baseflight PR#48 by Geobish/Timecop.
Redo sbus scaling/offset calculation based on data from FrSky X4R and d91ba93b8400ea118cd6fca1012c0ed2da14e3b7.
cli `exit` command now reboots without saving.

This also prevents excessive wear to the eeprom/flash and makes it the
difference between `save` obvious.

Fixes #146
Fixing acc_hardware in cli to the new supported sensors range.

Conflicts:

	obj/baseflight.hex
	src/cli.c
Fix MSP/Telemetry Arm/Disarm problems.

Tested with two MSP ports, one via softserial. Both with telemetry
enabled and without telemetry enabled.
Merge remote-tracking branch 'refs/remotes/upstream/master' into feature-timer