* interpolators use providers for client/situations/parts/ground elevation
* interpolators do no longer use own situations/parts, but those from provider
* interpolators are no longer QObjects (as it is not needed)
* use gnd flag from situation for gnd interpolation, there is no longer a parts gnd flag interpolation
* guess parts during interpolation
* changed iterators to m_s[i] as it makes clearer which values are used
** the flag is transferred from parts -> situation in airspace monitor
** if the other client already provides and gnd.flag in situation this also works
* adjusted logging
* use providers in unit tests / adjusted tests
* improved situation verification/assert
* all interpolation positions can be logged (3 for spline, 2 for linear)
* interpolated (log) time, setting to real time (i.e. unadjusted time)
* only set logger values with logger attached
* "dot" commands to log parts/situations
* log can also be displayed in simulator (if simulator can display text messages)
* fixed missings locks for m_interpolationRenderingSetup
* more detailed output
* renamings
* using hints in log
* some started with get/some not (removed get, get is normally used for our getters)
* some used swift, getSwiftXZY dir (removed swift)
* used full word "directory", not dir/directory mixed