Add Diagonal test to GBA siute

[pinobatch]

Upstream 240p Test Suite for Nintendo 64 has a new test called "Diagonal Test". At 3:48 in the video, see four 5-pixel-wide bars with 5-pixel spaces between them. This amounts to 35 by 200 pixels on N64 (or probably 35 by 140 on GBA).

Per the Diagonal Test source code, a plausible set of controls for the GBA is roughly as follows:

• Right, autorepeating at 60 Hz: rotate clockwise by 1/(360 * speed divisor) turn
• Left, autorepeating at 60 Hz: rotate counterclockwise by 1/(360 * speed divisor) turn
• Up: Decrease speed divisor (minimum 1)
• Down: Increase speed divisor (maximum 20)
• A Button: toggle automatic rotation in last rotation (Left or Right)

Because 1/(360*19) and 1/(360*20) are so close, the rotation angle will need all the precision it can get. Consider a 32-bit fraction of a turn, and consider evaluating the sine and cosine using CORDIC.

[ArtemioUrbina]

It will be awesome to see it on GBA! I have only added this test to 3d capable consoles so far, like Dreamcast, GC and Wii.