ton of typo, grammar and punctuation fixes

I whipped up some code to strip out all the text nodes and concatenate them into a text block I could paste into an online spellchecker.  I chose the following one because it let me put in large blocks of text:
http://www.microspell.com/fixmytypos.html

Worked off that list. Often when I found a line with a typo, there would be more there because it's likely it wasn't checked. Sometimes other typos gave me ideas to search the whole file for, like fixing all the "it's" that should be "its."  I probably corrected a few things in the comments to avoid having to determine context every time. I also fixed grammar (especially breaking up run-on sentences) when I saw it. I went through all the RS ship names and put them in single quotes since the text that's being spoken is already in double quotes. Otherwise, it just looks bad with double quotes nested in double quotes.  Ideally they would be italicized but whattyagonnado.

I added a handful of flavor edits, like making sure some single "s"es in mantis speech were doubled.