fix(io): add some Dependencies.cmake
To build our current projects with sight 21.0, we needed to add missing `Dependencies.cmake` files, otherwise people would have to find the necessary `find_package`commands to run first. Besides this, an unrelated change has been made to reenable the load of extra bundle paths. This is needed when you depend on more than two repositories. Closes #693 Merge branch '693-io-add-dependencies-cmake-in-io_vtk' into 'dev' See merge request !552