Code cleanup

Simplified the codebase by removing a lot of redundant code. Whilst
the movie lookups and unified metadata parsing may be reintroduced at
a later stage, right now they served no real purpose.
Set the correct region

Plex uses GB instead of UK.
Update icons

A number of Plex clients incorrectly displayed the icons, often by
clipping the width if it was larger than the height. The icon
dimensions are now 800x800 and should be correctly displayed in all
clients.