Added implementation of the Constants_wrapper to read the constants not needed at
compile time from a file.
It compiles but implies the constants in Costants.h not to be const
Constants.h is imported in all the sources and headers so when linked many errors
of the kind:
Food.o:(.bss+0x0): first defined here

We need a solution. Program options save the constants in a map, that map has to be
available to all the sources.