* Give silicons proper lobby/character editor previews
No more naked dummies, properly show a borg/AI sprite now.
This means taking the JobEntity into account when spawning the dummy. For AIs I had to add a "JobPreviewEntity" field because they'd look like a posibrain otherwise. AI therefore uses a custom dummy entity I defined.
Also I had to add some margins to the UI, because otherwise the 32x32 sprite of the AI would look bad.