fw landing: improve slope altitude calc to avoid climbout after waypoint, throttle cut is now defined via altitude

Mixer load: don't upload empty mixers from non-existing files

Startup: Raise min throttle

Startup: Hex vs Hexa

Fmuv1 ram cleanup

This reverts commit b457e714.

Optimize and update data manager docs

Move repeated code to common function
Update missing and misleading comments
Fix data manager test compile errors
No functional changes

fw landing: improve slope altitude calc to avoid climbout after waypoint. Throttle cut is now defined via altitude

Remove differential aileron mixing for flying wings

Set default autoland wait time to -1 (infinite wait)

commander sets vstatus.condition_landed = false for fw systems (until we have a landing detector): solves multiple issues with the state machine in the navigator app