TypeArguments: eliminate StackOverflow while retaining accurate types

[xRodney]

Fixes #333.

While the original fix replaced the recursive mapping V -> List<V> with V -> List<?>, here I take a more subtle approach. The mapping is replaced with V -> List<V>[replaced=true], where he [replaced=true] is an attribute. The visitor never replaces class refs with this attribute and while doing so also removes it, so that the resulting type tree is clean.

Because the goal of this is to be usable in crd-generator, I also added a new convenience method RichTypeDef apply(ClassRef) (I actually renamed a pre-existing private method with the same name to make room for it). This can process the types all the way from a generic reference (as opposed to from a definition)

Related: fabric8io/kubernetes-client#4357

[iocanel]

lgtm

[xRodney]

Hello @iocanel and thanks a lot for your review. Would you please mind merging and releasing it?

[xRodney]

Hello again @iocanel,
I realize you might be busy, but is there a chance you could have another look on this? Or at least a rough estimate when you'd be less busy? We are blocked by fabric8io/kubernetes-client#4357.
Thanks a lot.