Support Ball Drain -> Support game logic

[neophob]

Expose an additional Button to simulate the Ball Drain.

[neophob]

to support this, game logic needs to be implemented - like pinmame

[neophob]

First #10 needs to be implemented

[neophob]

see https://github.com/bcd/freewpc/blob/master/sim/tz_sim.c for an example

[neophob]

some examples for ball drain do work - could resolve this:

• solenoid triggers switches automatically
• update switch state with new settings (similar to initial state)