fix graffiti translation origin stuff

[thenfour]

graffiti right now is a bit hacky because of limitations with CSS transform. You cannot combine transforms, so in order to have separate multiple transforms, you have to nest <div>s, or find some other way. This is why for the moment there are graffiti classes like "rightfacing_spotlight". I would rather separate these effects, but can't.

so there are some side effects i want to eliminate:

• transform origin and element size are not clear. which makes things like the rotating revision logo not centered properly.
• transforms must bleed into unrelated classes. we should determine a practical <div> stack
• let's make room geometry a structured thing, because we will always use isometric. global vars to control rightfacing / leftfacing / upfacing / etc, so ALL rooms can share the same graffiti effects.