Global rewrite of the app: what should be addressed first

[readbeyond]

Current sins, in order of importance:

1. the JS code needs to be modularized --- I (Alberto) have no idea what JS framework/library/whatever is best for the task, if any is at all;
2. the XHTML contents should be loaded in an <iframe>, not directly into a <div> in the app view;
3. UI should be designed by an UI designer;
4. library info and user settings are stored in localstorage => should become a real db, e.g. sqlite;
5. remove some shortcuts in parsing/supporting EPUB, e.g. multimedia preloading;
6. better pagination (current is decent on iOS but buggy on Android);
7. most user-requested features: notes/bookmarks and dictionary support.

[readbeyond]

Also:

1. remove FXL support, current is half-backed;
2. support swapping UI language at runtime (e.g., loading localization files), remove (or find human translators for) all translations but English and Italian;
3. more testing on a broader set of devices.