Show exception records and mark trap frames

[discostu105]

Exception records are not properly analyzed yet.

exr -1 shows the last exception record. It would reveal the real exception frame as well as details (e.g. which address was accessed in an access violation).

Getting the real exception frame, would also mean we could either change the stacktrace to omit the exception-handling/stack-unwinding frames (in WinDbg this is done via .excr), or we could keep the full stack, and just mark that frame with a tag.

Exception Record could be reported as an extra piece of information, and the faulting frame should also be considered in duplication detection algorithm.

[AuroMun]

We've been utilizing Superdump for a project and it's been great! We did some work on retrieving the exception record for unhandled exceptions and display that as extra information, and would love to merge those changes to the repo.

[discostu105]

@einsteino Cool. Feel free to open a PR, I'm happy to have a look!