Added support for lists, ported image interface

This commit provides
* Support for lists, that are managed with QDeclarativeListProperty
* A port of Facebook image interface
* Rework of tag (closer to Facebook API)
Renamed some interfaces

Some Facebook entities, like Photo have a lot of non-identifiable
interfaces attached to them (tag, name_tag, image). Some of them
have a very generic name, and might be confusing.

Adding the name of the Facebook entity on which these interfaces
are attached is a good way to disambiguate them.