Rename some ap* methods to cmd*.
Draw white box around some features, when they need attention.
Small adjustments to the EFIS and HSI.
Remove unused accessors.
EFIS speed minimum/maximum values.
Workaround Qt painting misbehavior.
mv xefis-windows.xml xefis-displays.xml
Paint landing altitude correctly and altitude warnings (1000 and 500 ft).
Update sky/ground colors.
Paint NO VSPD warning if speed value is invalid.