Programs: imc_download.py: Added script to download IMC git repository.
CMake: Moved IMC related code to cmake/IMC.cmake. Added target (imc_download) to download IMC git repository.
DUNE/IMC: Removed IMC.xml from DUNE repository.
DUNE/IMC: Added code to retrieve information from Git repository.
DUNE/IMC: Generated constants file.
Merge branch 'feature/imc-sync'