Clean up soundfield simulation related applications
Todo:
[ ] Increment version number to ensure setup is rerun to resolve path issues
Changes:
- putting all sound field simulation classes/files in one folder
- Numeric
- VirtualAcoustics/Raven
- VirtualAcoustics/diffraction
- removing unsed applications/Numeric/SH folder
- moved IniConfig to external_packages
- clean up Raven folder
- renamed load_ac3d to itaAc3dModel (backwards-compatible: load_ac3d now returns object of this class)
- removed all xml related stuff (this can now be found in RAVEN-Installer)