Code allowing the use of sonar without requiring a barometer.

This code has been flight tested on a Naze32 acro, with no barometer onboard.  It also works when the target doesn't have BARO defined.
Updating RX documentation.
Update led strip code to use HSV instead of RGB.
Store colors in flash, copy to ram and use from ram.  Store mode colors
as color ids instead of duplicating the color data.

Later, this will allow configurable colors as the colors can be copied
to the master config and used from that without any ram penalty.
Move colors from ram to master config.  Initialise colors only when
config is reset to defaults.
Update ledstrip unit test.
Allow colors to be configurable via the cli.

color x h,s,v

x = 0-15
h = 0-359
s = 0-255
v = 0-255
Add throttle level indicator led mode
Merge remote-tracking branch 'cleanflight/master' into cleanflight-throttle-led
Adding note regarding color index usage.
Merge pull request #83 from goebish/cleanflight-throttle-led

Throttle level indicator led mode
Update LED throttle mode to use rcData instead of rcThrottle, avoid
having to reference min/maxThrottle.

Range was not being calculated correctly.

Throttle color now blends with the current color of the LED so that at
mid throttle any orientation color is still correct when mixing Throttle
and Flight Mode on an LED.

Fix tabs.  Reduce nesting level.
Updated LedStrip docs for new thrust/throttle mode.
CC3D - Add support for battery voltage monitoring on S5_IN.

See docs for further details.
CC3D - Add Buzzer support to PA15.

See Docs for details.
Latest CC3D binary.
Improve speed of LED STRIP code.

Shaved about 150us each strip update.

This commit leaves in some timing trace code for the CC3D target, the
results of which can be seen in the debug variables for the sections
being timed.

A later commit will remove/disable the timing code.
Update LEDSTRIP unit test.

The recently added throttle mode broke compilation of it.
Removing timing instrumentation from CC3D & LEDSTRIP build.
Updating example LED STRIP documentation config for Spider quad.

Left-front rear-facing LEDs were not configured correctly.