Made VRAM update possible.

Using static methods instead of global functions.

Faster render and better colors.

Also fixed frame global memory issue in libretro.

Running under a single call.
This required increasing variable size from u8 to u16.

Created infrastructure that allows the usage of the serial device to capture the result of the tests.
Then the test is executed agains a pre-defined number of cycles and the result is compared against expectation.