A New Bugzilla::Auth

[Max Kanat-Alexander]

	In order to pave the way for mod_perl support, one of the largest tasks
I had was to re-write Bugzilla::Auth to not require a BEGIN block. Since
I had to restructure it anyway, I did a lot of re-architecture.

	In effect, we have an entirely new Bugzilla::Auth system, that should
be more flexible and easier to write new plugins for. To maintain
stability, I kept nearly all the old Bugzilla::Auth code, I just moved
it around a lot.

	It was a huge task (probably about 20-30 hours of actual coding), but I
have now finished a working patch.

	As it's such a large re-write, I'd really like many eyes to look over
it. It's at:

	https://bugzilla.mozilla.org/show_bug.cgi?id=300410

	I've written a long, detailed guide to the patch in a comment on the
bug, including a "How to Review This Patch" section.

	-Max
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