WIP Horizontal scrolling

[hebertialmeida]

This is a more complete implementation of horizontal scroll, lets work based on this one.

Thinks to consider:

• A config that allow init on specific orientation and enable or not orientation switch.
• If allowed user should be able to switch the orientation inside the reader, probably from Fonts menu.
• Because of this change for a better UX probably we have to kill left menu and use only for Table of Contents.

This will closes the issue #22