Don't use the GWT mouse button constants with Elemental2

PSA:  GWT uses old mouse button constants in com.google.gwt.dom.client.NativeEvent:

public static final int BUTTON_LEFT = 1;
public static final int BUTTON_MIDDLE = 4;
public static final int BUTTON_RIGHT = 2;

These are not the correct values to use with Elemental2 elemental2.dom.MouseEvent.button.

JavaScript now uses https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/button so these are the correct values:

public static final int BUTTON_LEFT = 0;
public static final int BUTTON_MIDDLE = 1;
public static final int BUTTON_RIGHT = 2;

The keyboard key code constants are also old in GWT, but that one was obvious, as GWT has key codes as integers, while Elemental2 has key codes as strings.

I couldn't find any definitions for these new mouse buttons or key codes.  I still need to have a look at projects like Akasha and Elemento, as hopefully they fix these Elemental2 gotchas.

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