Added default distance and default minimum distance in calibration section, already recognized by binaural free field renderer. Also a lot of comments

Avoiding a lot of C4512 errors and introducing volume getter with calibration mode from core in all rendering modules

Removing internal sound speed handling and substituting with core-provided homogeneous medium information

Reverting all cubicspline default switching algorithms to linear, since this is enough quality and there appears to be a bug in the interpolation routine (tbd)

Moving from macro-based renderer registry to a procedural registration during core creation for 'internal' renderers.
Also refactoring Freefield to FreeField (or FREEFIELD to FREE_FIELD) and adding some more qualified names to classes, i.e. 'GenericPath' as 'PrototypeGenericPath'.

Introducing auto-generated VACore including paths and config possiblity via CMake. Also, VACore.ini is not under version control, therefore individual changes made are not forced to be committed.
Adding development switch for cross-talk cancellation sweet spot widening.
Refactoring and doc for VA factory.
Adding dev switch in NCTC reproduction for sweet spot widening.

adding VAPrint for current working directory (important to find relative paths like data and config files and folders)

Adding verbose output monitor that prints output RMS and warns if the overall output is zero. Activating NCTC reproduction module for default config

upd: refactoring names in generic path - going back to filter length and delay using integer samples instead of time in seconds or milliseconds.