Integrate Create Plan overlay in File DropPanel

New Create Plan support

ArduPIlot Follow Me setup

Add collision avoidance settings to Safety Panel

Fixed places where the font family was not being defined (therefore using the default system font)

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

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>