[invader-refactor] Exclude explicitly set names from -R

[Aerocatia]

The find and replace feature should ignore names set in the same command.
For example invader-refactor -M move -r foo/bar foo/baz -R baz foobar will result in "foo/baz" being called "foo/foobar"

While this logically makes sense, it is counter intuitive to have it stomp over something you just explicitly set.

[Aerocatia]

Here is a better example of this biting you:
invader-refactor -M copy -r foo/bar foo/bar_custom -R bar bar_custom
foo/bar -> foo/bar_custom_custom