Adds buttons to allow you to widen the container when viewing files and hide whitespace when viewing pull request diffs
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Allows you to widen the container that holds code (individual files and diffs) up to 95% of the width of your window. It also reverts it back to normal when you click it again. The other button reloads the page without whitespace in diffs by adding 'w=1' to the URL query string; clicking it again will reload the page with whitespace.
