Split screen table of contents.

Fix for TOC toggle zoom out jitter.

Scroll from *TOC* now remembered by web view across app restart.

Fix for TOC rotate crash bug.

Tapping “W” menu toggle or search box dismisses TOC.

TOC landscape divider gives more room to web view.

Fix for TOC blue selection flickers when scrolling from web view.

Now stripping html from TOC titles.

Change-Id: I0c11bdad96fb718eddf089fbd09026dc7024a10d