A default of 10s makes more sense compared to the old 4s, as this is only the
max time of a back transition and it's also decleared completed if the
speed drops below the hover cruising speed (MPC_XY_CRUISE).
Signed-off-by: Silvan Fuhrer <silvan@auterion.com>
- use `gazebo-classic` everywhere consistently referring to the original Gazebo (eg version 9,10,11)
- additional `gazebo_*` helper targets added for compatibility, but warn about deprecation and tell you the new target naming
- use `gz` everywhere when referring to Gazebo (aka Ignition Gazebo or new Gazebo)
