Disable dual page mode when ComicInfo.xml indicates double page

[OGKevin]

When ComicInfo.xml's DoublePage attribute is true for a page, automatically disable dual page mode for that page. This prevents the case where we will dual page a double and a single page, making it unreadable.

Steps:

1. Detect the DoublePage attribute in ComicInfo.xml for each page.
2. If DoublePage is true, ensure dual page mode is disabled for that page.