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Add support for forward and back mouse buttons #1919

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This commit implements the extendedMouseButtons pseudo-encoding, which makes it possible to use the forward and back mouse buttons.

It looks like chromium is the only browser that has support for this currently. See #1918 for more info.

Confirmed that it works with chromium on Mac, Linux and Windows against TigerVNC server.

@CendioHalim
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This MR should partly fix #1920, but only on chromium.

This commit implements the extendedMouseButtons pseudo-encoding, which
makes it possible to use the forward and back mouse buttons.
Comment on lines +1067 to +1068
* NOTE: This only works on chromium-based browsers. There is
* no support for firefox/safari.
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Strictly speaking, Safari has buggy support rather than no support. Right?

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Correct.

I just realized that safari send the incorrect ev.button value, but the button mask ev.buttons seems to work correctly. With back pressed, ev.buttons is 8, and with forward pressed, it is 16.

We could look at those instead of keeping mouse button state ourselves?

it('should send correct data for extended pointer events', function () {
RFB.messages.extendedPointerEvent(sock, 12345, 54321, 0xab);
let expected =
[ 5, 0xab, 0x30, 0x39, 0xd4, 0x31, 0x01];
expect(sock).to.have.sent(new Uint8Array(expected));
});
});
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We'd also like tests for the interaction with the pseudo-encoding and pseudo-rect.

[ 5, 0xab, 0x30, 0x39, 0xd4, 0x31];
[ 5, 0x2b, 0x30, 0x39, 0xd4, 0x31];
expect(sock).to.have.sent(new Uint8Array(expected));
});
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The masking should probably be tested as an explicitly different test.

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