First part of GN6 test case modification.

Moved external functions fx_computeDistance and fx_computePositionUsingDistance from GeoNetworking to Common to be used by other modules (like Cam) as well.

Mantis #6137: f_startBeingNeighbour delay

- Circular area
- IUT Mac Address PICS and refinedGeoNetworkingReq templates
- Removed 10sec timer in preamble (GetLPV)

Changed timestamp computation so that they look a bit 'older' (~1s)

f_acGetLongPosVector which retrieves the info from received beacons.
Introduced new AcGNEvent and AcGNResult to handle the request.
Added mapping of ac port.
Restructured confXXUp functions to initialize the IUT before trying to get the beacon's long position vector.
Removed prInitialState from testcases as it is done now in the confXXUp functions.

Position checking now with delta.
Propagating tester node GN addresses.
Checked TODOs.

Harmonized upper tester functionality in centralizing it in LibItsCommon_Functions and LibItsCommon_TypesAndValues.