Optimized data rates for HiTL simulation. The new behavior stores the
metadata rates when the first simulator is started. When the last simulator
ends, then the original metadata is rewritten.

Also removed unused deleteSimulator signal, unused telStatsUpdated
function, and redundant setupWatchedObject function.
Fixed bug by which flight controller outputs (e.g. simulator inputs) were
dependent on which controller input was active, and not which simulator was
being used.
Optimized transmitter calibration wizard metadata rates.

Also solved bug by which update rates were incorrectly reset during
the wizard. In this case, there was a metadata reset followed immediately
by a set. This reset/set operation occurs too quickly and the telemetry
system only sends the first operation to the board. The result was that the
final steps of the wizard were very slow.
Optimized telemetry rates for calibration class.
Changed ReceiverActivity to throttled. This is justified because this UAVO
is only used by GCS in order to identify the transmitter channels
Improved comments about transmitter calibration routine. Fixed missing
UAVOs.
Changes requested in review.
Revert "Changed ReceiverActivity to throttled. This is justified because this UAVO"

This reverts commit e9a112d82faa4b9b8ffd84f1752a3a1e842ebad3.

It was requested in review that this UAVO not be altered without
extensive transmitter calibration testing. Historically, the
transmitter calibration process has been delicate to tune
properly.
Merge pull request #444 from kubark42/metadata-optimizations

Metadata optimizations