Add Close All and some cleanup

- Correct typo in applet.js (metewindow to metaWindow)
- Add "Close All" right-click menu option
- mostly normalize spacing in specialMenuItems.js (looks fine in vim with settings but before this looked very wrong in github, because a mixture of spaces/tabs was used)

I have tested the "Close All" locally and I am currently using this commit on my own machine.
Resolve #57