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- adjusted cubic spline interpolation to directly use doubles instead of convert to floats

++ Outdoor-Renderer history settings
++ Airtraffic-Renderer medium type and atmosphere filepath

- added config option to set history buffer size
- bugfix in SetParameters if using data histories
- renamed history of ReceiverWF to WFOrigin

- now sets data ptr to nullptr if removing an object

- modified SetParameter to also work with history
- Wavefront: added set function for delay in seconds

- implemented first version of using filter property histories (not via SetParamaters)
- added switch in config to enable/diable histories

- added histories to wavefronts

- removed VADataHistoryUtils namespace and including helper functions

- now checks on time monotony when pushing to queue
- now has get methods for last timestamp
- concurrent_queue is now private instead of protected

- bugfix in interpolations if time stamp exactly matches timestamp of sample
- added history for booleans
- extended tests accordingly

- added history model for VAVec3 class

- removed calls from IVAInterface->SetActiveSoundReceiver() (removed method)

Merge branch 'develop' of https://git.rwth-aachen.de/ita/VACore into features/AirTrafficRenderer_RayTracing

- added test based on gtest framework

- renamed interpolation method enum
- added a minimum amount of samples which is to be kept when calling Update()
- small bugfixes

- removed enum for interpolation method outside of class
- cpp file has an IW now
- Update() now gets a timestamp to delete outdated samples

- interpolation method is now set in constructor and cannot be changed afterwards

- added base template class plus classes for double and ITASpectrum

- now does not need id for update scene of sim scheduler anymore

# Conflicts:
#	src/Rendering/Prototyping/RoomAcoustics/VAPTRoomAcousticsAudioRenderer.cpp

- scene update for scheduler now uses VA timestamp

- now removes wavefronts if source is deleted

- now properly removes wavefronts from maps
- added method to remove all wavefronts from one source

- added method to get source ID

- now paths are stored per source-receiver pair in a separated class

Adding sound receiver mute method implementations and removing active listener methods. Also trying to apply the muted receiver concept for all current renderers (untested).

- added first implementation of PostResultReceived() which handles simulation scheduler result

Active listener is ignored by binaural free field renderer now. output will be mixed for all available receivers, use receiver muting to implement the active listener concept

- renamed class and method names properly