GXemul Code2

Adding initial MIPS16 support.

Removing two unused variables.

Adding initial MIPS16 support.

Adding -g to the test_mips compilation flags.

Separating assignments of different pointer types, to remove compiler warnings.

Adding some more ARCBIOS functionality.

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Increase write performance of the framebuffer; if the data to be
written is equal to what is already stored in the framebuffer,
then simply return.

Trying to make the framebuffer feel more responsive.

Cobalt emulation now uses RM5200 by default, not R4000.
Initial experiments with ARC has begun.