This no longer seems to be applicable
Make sure we only report stuff the test loaded, no additions from ourselves

What exactly was loaded is an important part of the diagnostic. Make sure that
we only report on things that was loaded before us
Rearrange skip logic to fire subsumes() last (no func. changes)

Regexing is much cheaper
Drop dependency on Path::Tiny, no longer chdir in our END block
Reduce minimum C::T version (did not have any code-changes since 0.21)
More robust error detection, add fail-in-END support

Also drop the T::B version requirement (doing so is cheap, and the
module scope warrants it)
Rewrite diag generator for easier modification (no func. changes)
Add diagnostic of "Attempted-but-failed-to-load" on perl >= 5.10

May very well be useful for conditional A/B dep diag