ROOT.jl code generation

Setup to generate code for the ROOT.jl package using WrapIt!. ROOT.jl is a Julia interface to the ROOT C++ framework.

Contents of ROOT.jl generated with this code:

• Project.toml;
• deps directory and its contents;
• src directory and its contents.

The code is generated with julia -project=generate.jl command and placed into the build subdirectory.

Wrapit configuration including to list of classes to wrap is defined in ROOT.wit.in.