Sign synthesizer

This little nifty device is one step ahead of a complete station construction/deconstruction ability.

It lets you select a sign from a (programmically) generated list of signs available, and then slap it onto your wall of choice.

It also lets you remove existing signs from the walls.

Note that this is not done yet, I'm throwing it out here for commenting on ideas and my code.
Things to be done:
* Add a delay to pasting/removing
* Fix afterattack/use some other method
* Make the menu use cool-HTML
* Any TODO's left in code
* Should I implement a fuel/charge/ink level thing?