[Greasemonkey] The great Greasemonkey clean-up

[Aaron Boodman]

So I've finished the refactor/clean-up I was working on and checked it
into CVS on HEAD.

This significantly simplifies Greasemonkey since it no longer has to
consider Firefoxes < 1.5.

It also switches the code layout to a system similar to the one which
I created for Google, which we first used on Firefox Web Comments. It
isolates an extension's code from all the other code in Firefox by
loading it into an XPCOM service. There should now be much less chance
of Greasemonkey conflicting with any other extensions.

If you have any interest, I encourage you to check out the latest HEAD
and take a look around.


- a