CSS rewrite for 'Shortcut Edit' dialog

CSS and HTML changes only. Tested in Firefox & Chrome.
JS for changing the sort button label
Fixing the positioning of the popup dialog

Instead of using hardcoded width, get the actual size of the div, then
add space for scrollbar.
Fixed script and made CSS more persistent

Works flawlessly except for some pre-existing issues with the sorting.
Rejigger the shortcuts bar

clean up aisle 1
Part 2
Font size importance
Oooh, new arrow glyphs and nice alignment

Including subreddit compatibility additions.
Remove test code
Adjustments and browser compatibility

Tested on dozens of subreddits with Chrome and Firefox on Windows. No
known display issues presently.
A more robust if statement
Change of tactic

Found that some popular subs were being unreasonably strict and breaking
bg colors, so I'm putting my foot down. Now you can't not have a
bg-color.
Remove old if statement
Reduce width of shortcutEditButtons
Remove border
Move redrawShortcuts() to original place
Fewer lines affected and glyphs for + and x

Put the code for the buttons back in their original order so fewer lines
are affected, but maintain the desired ordering.
Fix minor things in README

Correct nested lists, capitalize browser names and languages consistently, link to more information consistently
Merge pull request #1332 from tobiasvl/minor-readme-fixes

Fix minor things in README

thanks, housekeeping is always appreciated!
showImages: Added OneDrive to ignore lists, files didn't load.