Implement MADD1/MTC0/JALR/SD and rewrite COP0 decoding

* COP0 instructions sadly have way too many encoding to use a single template one them,
so rewrite the decoder to manually extract the required bits for each instruction. This
fixes a bug where the MTC0 instruction was mistaken for MFC0.

* Implement more instructions so we can execute more of the BIOS. In addition fix
an oopsie in the ORI instruction which fixes some bugged memory writes. As of now the
BIOS tries to write address 0x70003fe0 which maps to the scratchpad memory (assuming no further
logic errors are present). Need to investigate why this is and how to emulate it before
continuing...