CATCH restores stack state incorrectly about pforth

[philburk]

The THROW docs at:
https://forth-standard.org/standard/exception/THROW
are pretty clear about all the stacks being restored to their depth when catch was called.
So pForth has a bug.

I need to check to make sure the float stack is also handled properly.

[philburk]

I have tried twice to fix this and it is not easy.
PForth does not implement CATCH THROW like a normal Forth.
CATCH actually calls the inner interpreter, this is pfCatch().
Fixing this would require some major refactoring, That is too risky for the 2.0.0 release.
So I am punting this to a later version.