Add "Version" to source code

[antonio-leblanc]

It would be interesting to have the version somewhere in the program, and maybe e version command? It would be easier to track changes

We could change CommandShell.cpp with

cout << "Welcome to the ForeFireShell v1.1.0" << endl;

but it's better to have this variable in somewhere else

EXAMPLE:

[antonio-leblanc]

https://stackoverflow.com/questions/27395120/correct-way-to-encode-embed-version-number-in-program-code

"You would typically have a separate header that contains only those defines and nothing else (except the header-guard), to minimize dependencies."