Better documentation on exclude

[tiloc]

I am trying to exclude any Flutter SDK packages from the output. I have tried a lot of variations:
--exclude=^flutter.*
--exclude=flutter.*
--exclude=StatefulWidget
--exclude=.*StatefulWidget

none of these seem to have any effect. I am looking for better documentation on such a use-case and maybe a --verbose option for dcdg that prints out whether it believes something is a match. It is unclear to me whether the package names, such as flutter:: are part of the class name that needs to match.

I have also attempted the --exported-only option as an alternative, but that leads to broken output with numerous repeating fields.

[glesica]

Most of the exclude stuff hasn't yet been implemented. Take a look at #1 for status. Right now it only works on class names. I'll take a look at the --exported-only, there might be a bug there.

[glesica]

What's broken about the output when using --exported-only?

[tiloc]

I get to see the same field name several times.
I have spent the past 2 hours or so familiarising myself with the package and adding some better exclude functionality plus a new "--verbose" parameter. Will show you my PR probably later today, currently making sure the tests run.

[glesica]

Can we close this? It seems as though #1 captures the rest of the issues here that weren't fixed by #34.