Motor spin up sequence for coaxial helicopter

[PrcsnFlyer]

Describe problem solved by the proposed feature

One of the main benefits of a coaxial helicopter is its compact shape. For storage and transportation usually the rotor blades will be folded down. Before takeoff the rotor blades need to be unfolded so they don't clash. In the current airframe configuration (Helicopter - Coaxial) both motors start spinning at the same time. Under various circumstances this can result in clashing rotor blades.

Describe your preferred solution

Create a parameter to configure a spin up sequence. Probably similar to COM_SPOOLUP_TIME The following spin up sequences should be configurable:

1. Spin up Motor 1 and 2 at the same time
2. Spin up Motor 1 first, then Motor 2
3. Spin up Motor 2 first, then Motor 1

The name of the new parameter could be COM_SPOOLUP_SEQUENCE

Describe possible alternatives

Additional context