Also added all major APU constant addresses.
Disabled serial transfer on state loading.

Made read MMU a non mutable operation.
Added support for CPU description.
Added Display support for CPU.
Extracted type definition for `Instruction`.
Support for diag_gb!() - uses global unsafe approach, which is not problematic for the purpose.
Inline fetch() operation in cpu clock.
Moved pedantic validation up in the CPU.
Fix simple diag issue.
Changed naming of read and write unsafe ops to raw.
New pedantic asserts.
Fix an issue with HDMA destination address prevent CHIP-8 ROM from
working.

More standard support for the `BusComponent` interface.

Allow simple screenshot saving.

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.

Also removed the not needed bitwise operation.

This changes the way the device is called.

For the bool to int conversion.

The image data buffer printing is still pending.
Still a lot of TODOs and edge cases to be solved.

Allowing better directory usage.
Created initial printer file.

There's already two drivers implemented: Null and Print (to stdout).

The complete GB, CPU and MMU linking is done.