* Fix the Doodad Dropper and Registration windows not stealing the focus
when they are opened via menu bars.
* Bugfixes in gamepad support: stop at the first controller found,
Draw() to handle controllers going away and hide the mouse cursor
Adds support for Xbox and Nintendo style game controllers. The gamepad
controls are documented on the README and in the game's Settings window.
The buttons are not customizable yet, except that the player can choose
between two button styles:
* X Style (default): "A" button is on the bottom and "B" on the right.
* N Style: swaps the A/B and the X/Y buttons to use a Nintendo-style
layout instead of an Xbox-style.
