Switch to exact conversion constants

Use constant's inverse to ensure we don't accumulate error when converting back and forth

Hack out dynamic font sizing

Fixes to Offline Map Cache

This is all going away in 3.1 so don’t want to spend time fixing broken
font sizing

Adding a dialog telling the user the map cache database has been reset.

Change to match mavlink spec

Warn user on requiring 1.4.1 or above version

more qgroundcontrol -> QGroundControl renaming

Plan: Copy coordinate frame from prev waypoint as well

Update development version from git

Radio Cal: Fix channel monitor when reversed

-fixes #3756

Fixing a crash bug where a leaving vehicle was not being properly 

[APM] [Copter] Ch6 tune

Radio Cal: Fix reverse throttle check

Remove fading help text

Channel 6 Min Max

Channel 6 Tuning for APM Copter in tuning section

Remove Colon in Label

In Flight Tuning label

Log download: Correct ownership and deleteLater

Refresh params after airframe load