DAC point memory layout in protocol differs from implementation in physical DACs

[mitchmindtree]

The protocol specifies the layout as of DAC points as control, x, y, i, r, g, b, etc, however physical DACs seem to expect this order instead: control, x, y, r, g, b, i, etc. Not sure if this is a bug that has been fixed in newer DACs or if all DACs will expect this point layout and we should fix our protocol implementation.

[mitchmindtree]

If you're running into this issue, use the colour_layout branch.

We'll test the latest ether-dream DAC within the next couple of weeks and if that also uses the differing point layout, I'll merge the color_layout branch into master.