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.