mame & rom-tools 0.156

* Switch to SDL2

Closes #181.

Signed-off-by: Misty De Meo <mistydemeo@gmail.com>
mame: update 0.156 bottle.
rom-tools: add 0.156 bottle.
dwarf-fortress 0.40.19
dwarf-fortress: add 0.40.19 bottle.