[AIXM-483] Rename AirTrafficManagementService class

Description

Change name of class AirTrafficManagementService into AirTrafficFlowManagementService.

Rationale for change

See https://aixmccb.atlassian.net/browse/AIXM-237

The definition of class AirTrafficManagementService is: "A kind of service that provides flight planning and flow management operations." This definition is in accordance to how this class appears in the model and with the list of values of its "type" attribute.

However, the name of the class is misleading since "Air Traffic Management" is a general term, that includes air navigation, air traffic control, etc.

The name "AirTrafficFlowManagementService" would better match the list of values for its type and its definition, as shown at the right.

Impact assessment

[FWD_MAP_1:1] Data mapping is possible and no data loss occurs when data is exchanged from a system (A) that uses AIXM 5.1.1 for output towards a system (B) that uses AIXM 5.2 for input.

[BWD_MAP_1:1] Data mapping is possible and no data loss occurs when data is exchanged from a system (B) that uses AIXM 5.2 for output towards a system (A) that uses AIXM 5.1.1 for input.