Owen CL Helper

This extension adds a lot of helpful features to Dr. Owen's CSE CourseLib pages.
As a general rule, all of the pages with "Interact!" are courselib pages.

Features:

Site-Wide
- the "michigan state university" logo thing on the very top of the page now redirects to the base website rather than msu.edu (I have no idea who would ever want it to go to msu.edu instead)

Steps
- The navigation bar now shows your current progress in the assignment
- Hovering over the green bar also shows the progress of that element
- There is an extra nav bar on the bottom of the assignment pages now (you can't hover over it though, too lazy to figure that out)
- Shift+B (back), Shift+N (next), Shift+M (next and mark complete), and Shift+L (list) allow you to trigger nav bar actions without clicking.
- There is a step sidebar on all step section pages which allow quick navigation between steps (basically an abbreviated version of the list page)

Videos
- Touchscreens can now tap to play/pause (before touch events did nothing)
- On a video page...
- You can press left arrow to go back 5 seconds, and right arrow to go forward 5 seconds
- You can press + or = to speed the video up, - or _ to slow it down, or 0 (zero) to reset it to normal speed. This speed is also remembered across the site.
- There is also some text below the video which displays the current playback speed relative to the base 1.0
- Spacebar will play/pause (before it would scroll. It still scrolls if you are not focused on the video!)
- The play button is now centered (apparently the position property is animated in the css so it makes a funny floating animation towards the center)

Quizzes
- Once you've answered a question, you can now press Enter or Right Arrow to continue to the next question (before you could press enter to submit an answer but not go to the next question)
- These keys (enter and right arrow) can also start a quiz if you are on the main page of one.
- Quiz inputs no longer have autofill! This should prevent giant annoying walls of autofill suggestions.
- The first input box in a quiz (that's not hidden -- since there's a few hidden input boxes) is now focused automatically at the start of a question, to make it easier to tab through things