Add tlCursedVersions setting

[armanbilge]

For excluding mucked up or otherwise unpublished versions from mima checks. We've all been there. (Name subject to bikeshed.)

[rossabaker]

I usually just run my own filterNot on these, which can additionally target specific Scala versions. I don't have an objection to it, but I don't know that the setting adds much here.

[armanbilge]

That's a good point. I think the filterNot on mimaPreviousArtifacts is slightly more tedious because it's a set of module IDs and not versions. In any case I'm happy to let this sit and see if anyone really wants it.

[armanbilge]

Maybe the setting we are actually missing is a tlPreviousVersions, that is auto-populated by our plugin and then can be introspected/modified by the user.

[rossabaker]

In that world, is tlVersionIntroduced still useful? I guess it helps people avoid filtering on an ordering of whatever semver representation is settled on.

[armanbilge]

I've migrated a lot of builds and this hasn't come up. Happy to revisit if someone wants it.