* The BIOS tries to write to 0x1000f430/0x1000f440 which contain the
registers MCH_RICM/MCH_DRD. Saldy these registers are quite undocumented.
So the writing logic has been taken from PCSX2:
https://github.com/PCSX2/pcsx2/blob/master/pcsx2/HwWrite.cpp#L237
Forgive me, for I have sinned.

* 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.

* Now that the BIOS is loaded we can start executing it!
The starting address the EE uses is 0xbfc00000 which maps
to KUSEG1. Since all KUSEG regions except KUSEG2 are mirrors
of each other we only need to translate the address to the
KUSEG appropriate.

* The functional differences between KUSEG0/1 are minimal and
very niche so I won't bother emulating them now. Address wise
we can notice that the only difference between addresses is the
most significant half byte. By using that byte as an index in
a mask table we can define an appropriate mask for each KUSEG
address. Idea taken from a very handy PSX document I discovered
last year [1]

[1] https://svkt.org/~simias/guide.pdf (43)

* The ps2tek documentation states the memory map clearly [1].
It seems to have a similar architecture with the PSX, where
the main memory map (KUSEG0) is mirrored in multiple regions
(KUSEG1/KUSEG2) with different access patterns for each region.
For now we don't have to emulate all of them, just the main
memory map.

* Allocate the entire 512MB memory into an array and make a convenient
struct to abstract memory range operations.

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

* This commit adds a most basic CPU class that acts as a template
which we will slowly build.

* The architecture is pretty simple; the ComponentManager will create all
the seperate components (EE, VP, IOP, GS etc) as unique_ptr's since
it owns them and only it has access to them. All the other components
must pass through the manager to read/write data to memory.
To achieve this they are given a pointer to the ComponentManger in their constructor.

* For now the CPU directly accesses the bios which shouldn't
happen but will be fixed eventually when I implement generic
read/writes. The goal is to start implementing the CPU as fast as
possible in order to get to the GPU/VPU's and display something!