mc_pos_control: pass on parameter metadata

- separated in multiple files since original file was almost 1k lines
- Adapted descriptions to be more clear
- Adjusted some limits and decimals

src/modules/flight_mode_manager/FlightModeManager.cpp

@@ -236,6 +236,7 @@ void FlightModeManager::start_flight_task()
 			break;
 
 		case 3:
+		case 4:
 		default:
 			error = switchTask(FlightTaskIndex::ManualAltitudeSmoothVel);
 			break;