Adds slot machines to the game.

What it says on the tin.
It works with coins and shit.

emagging it is top lyl and shoots the coins at you.

Probabilities and values are currently completely arbitrary, feel free to suggest changes.

This does not place them on the map.
I find putting large chunks of code in Topic() very hard to track what does what. Putting the code in a proc and calling it from the Topic() will make it easier to separate the different concepts, which is the UI selection (if href and etc) and the result of the UI selection (spinning the machine).