add newline between include and namespace

Bugzilla Link	42767
Version	unspecified
OS	Windows NT

Extended Description

We have options to remove duplicate white-space lines, however, it would also be good for readability to be able to require at least one empty line:

• before and after and #include block
• before and after a namespace

//
// License
//
#include <memory>
#include <string>
namespace {

}

convert to:

//
// License
//
                            <<-- added empty line
#include <memory>
#include <string>
                            <<-- added empty line
namespace Bar {

class Foo {

};

} // Bar