Automatic forum character image

Automatic forum character image (todo_closed)
Priority	2
Component	forum
Fixable by	admin

Everyone has to upload two images at the moment: one to the wiki in 300×300, and one to the forum in 183×183. This should not be necessary, as the wiki already has the image.

Image compositing
We will use the exact same implementation for this as for other image related automation. So we only need to add a 'character image' source and we overlay the faction logo (probably) in the right bottom corner.