Fix the "import minidom as microdom" stuff in lore

[exarkun]

#3560 switched lore from microdom to minidom. To avoid lots and lots of extra diff, it left lore using the name "microdom" in most places, but made that actually refer to minidom.

Change all of the names used in Lore to minidom to make the code less confusing.

[exarkun]

(In [26745]) Branching to 'lore-microdom-imports-3619'

[exarkun]

I actually changed all the names to dom rather than minidom. Maybe this will afford us some more flexibility in changing to yet another DOM implementation in the future! Or maybe it doesn't matter.

Anyway I changed all the names and the  tests all still pass.

[glyph]

dom is still used as a parameter name a bunch of times in twisted.lore.lint, once in twisted.lore.slides, and as a variable in both of those modules as well as twisted.lore.latex.

But if the tests still pass once you've renamed those, go ahead and land it. Alternately, rename the import to something else, like 'minidom' as originally planned.

[exarkun]

(In [26928]) Rename this variable from dom to doc to avoid name collision with global

refs #3619

[exarkun]

(In [26929]) Merge lore-microdom-imports-3619

Author: exarkun Reviewer: glyph Fixes: #3619

Change the minidom as microdom imports in Twisted Lore to be minidom as dom instead, and adjust all affected code.