Warn when --exclude///> using exclude does not actually exclude any files from the project

[Gedochao]

Version(s)
1.5.4 and 4ab3227

Describe the issue
When declaring a path or pattern in --exclude///> using exclude, I'd like a warning if no sources were actually caught by the pattern I declared. This would make it easier to catch when my exclusion actually works.
Additionally, I'd like some debug logs under -v -v -v telling me which files were, in fact, excluded.