Add HuCC SGX VDC scrolling example

[pceDev16]

This adds a new SGX Example to the HuCC repository that shows users how to use the 2 VDC's on the SGX to do subpixel scrolling.

[Ryusennin]

Thank you for this example; subpixels are very useful for smooth coordinate and jump/gravity computation. Maybe this tutorial could be extended to explain how to use subpixels for the decimal part only (and keep full pixels for the integer part). It seems many platform games like Sonic work that way.

[Edit]

Come to think of it, real fixed point math would require a proper library, which is probably way outside the scope of this tutorial. Some references:

https://github.com/ElectricRCAircraftGuy/fixed_point_math
https://github.com/PetteriAimonen/libfixmath