Tests if Window-Clip systems are working correctly.
| Function | Status |
|---|---|
| BG Layer Clipping | Working |
| Object Clipping | Untested |
TODO.
It can be seen that the layer containing two Pacmans and three dots is clipped
in bottom (as Window1 is On for BG1 with bottom = 45), while the layer
containing a red and green square above a blue square is clipped in left and
right (as Window0 is On for BG0 with left = 80 and right = 120).
