State machines for meridian flip and Capture

This is the next step towards dedicated state machines for EKOS. This step contains:

• Introduction of a dedicated meridian flip state machine encapsulating both the meridian flip state of the mount and the overall state. This state machine is shared between Capture and Mount, which avoids mutual state communication.
• First functionality regarding the meridian flip is shifted from Capture and Mount to the state machine. Nevertheless, the complex operations are still part of the Capture code and will be addressed in one of the next refactoring steps.