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.

Created the `vebose` mode for diagnostics.

CGB is now going to boot using Boytacean ROM by default.
Allows better image and open source only boot.

Allows speedup and FPS measuring.

Uses a different file for the C structs of Libretro.
Makes it easier to manage the structure these structures.

Was creating major memory issues, including in the save of state files.

Adds warning on failing to set callbacks.

Should allow simple testing of the core.

Allows blargg's test ROM to pass.