* Having the header files in a seperate dir is only useful when developing
libraries that are meant to be used by other programs. In our case though
it makes the file structure more tedious so gather everything in one place.

* Currently the BIOS tries to write something to scratchpad and it fails
because its address is not our currently supported range. So add a new buffer
for the 16KB scratchpad used by the CPU and add a function to use it if the
address is in the correct range.

* Also shorten some function names and change some array to C-style because we
like to work with pointers and STL doesn't like that.

* 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...

* The instruction decoding was based on the handy table in ps2tek [1]
while the instructions themselves were written based on the document
added.

* The implementation makes heavy use of bitfields and unions in C++ to
make accessing different bits/sections of registers easier and more
intuitive. You may also notice the frequent casting (uint32_t)(int16_t)
which might seem useless but is there to force the compiler to generate
instructions to sign extend the offsets.

[1] https://psi-rockin.github.io/ps2tek/#eeinstructiondecoding