AeroFC don't have a SD Card or any other storage device, so changing
dataman backend to work over RAM to be able to load missions.

altitude controlled modes

Signed-off-by: Roman <bapstroman@gmail.com>

The current ICM-20608 is nearing EOL.

I have tested on both ICM-20608 and ICM-20602 based Pixracers.

   Upstream nuttx needs to have the flash programing support added.

land_detector: Hotfix to prevent ground contact detection when descending velocity is very slow with manual stick all the way down
Now the stick down check is only done in manual control and the thrust low is again mandatory to detect ground in any case.

We will be adding another parameter to set min starting temp, so this name needs to be made less generic.
Fixes typographical errors in the description