AltMode visual tweaks

The X-UAV Mini Talon is a V-Tail plane. This commit adds the
new group "Plane V-Tail" together with a svg image for the
new group.

Automated preflight checklist: Initial commit. Note that this requires an autopilot firmware that writes the respective health flags in the SYS_STATUS mavlink message

Handled "airspace visible" state (not done)
Adjusted restriction map items color and opacity
Added/Updated icons for airspace traffic
Adjust colors for text over maps

Move all airmap related stuff to its own directory

Eliminated flight widget "states"
Define flight widget top margin (plugin options)

Adjust colors
Remove unused image

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

Increasing a bit the bottom margin for the confirmation dialogs
Changed the color for the guidedActionConfirm dialog to the palette’s alertColor
Disabled onHeightChanged on ToolStrip for the time being as it was not working. I need to come back to this and see why it hides “optional elements” even though I have plenty of space for them.
Adjusted the color for disabled text so you can read it within the ToolStrip