Ryan Hendrickson d7c051e807 Add preferences for default scroll/spread modes
This commit adds `scrollModeOnLoad` and `spreadModeOnLoad` preferences
that control the default viewer state when opening a new document for
the first time.

This commit also contains a minor refactoring of some of the option UI
rendering code in extensions/chromium/options/options.js, as I couldn't
bear creating two more functions nearly identical to the four that
already existed.
2018-05-14 23:10:33 -04:00
..
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