See if we can replace package lookup with hunter

[mdavezac]

Hunter

[mdavezac]

Probably means modifying hunter so that it looks in more than one place for recipes.

[mdavezac]

The main difference that I can see are:

• might be a bit complicated when wrapping non-cmake files
• does download/compile/install of dependencies at configure time (not build)
• does not check for system packages (easy to fix with extra functions)