Prevent shutdown ordering crashes

PX4 doesn't retry commands by default

No need to add dynamic MockLink comm links

altitudeAMSL and altitudeRelative do not need divide 1000，the unit is meter and float format。 can you use _handleGlobalPositionInt message for altitudeAMSL and altitudeRelative？ because _handleGlobalPositionInt is default 5Hz and _handleAltitude is 1Hz.

It's not desired to have automatic log streaming for several reasons:
- There's already SD logging (which is the case for the majority of the
  users)
- The link does not provide the necessary bandwidth (eg. wireless telemetry)

* Some code moved to Vehicle

* Moved from UAS
* Remove unused code

* Make MainToolbarIndicators reusable by other views
* Change to font based ratio sizing