This aligns the behavior and concept with the 32 bit FSX version. SimConnect
is loaded at runtime, depending on the version being selected.
It also adds a featuren to change the P3D SimConnect version at runtime by
unloading the previous and loading a new one.
ref T349
* base reange for request IDs
* all operations use offsets
* we can conclude what an id is used for (debugging)
plus
* minor Doxygen fixes
* some renamings
* connect with "about to quit"
* added interface declarations
* sim statistics, use common function setStatsRemoteAircraftUpdate and double for average values
* split functions, added findClosestElevationWithinRangeOrRequest
* obtain elevation ids (separate ids are easier to track)
* also added experimental "physicallyAddAITerrainProbe" (FSX) for the FSX elevation probing
* callback / signal when requested elevation is received (async)