ZXHawk - Big updates

[Asnivor]

• Z80A performance optimisations (Z80AOpt)
• UPD786 disk controller accuracy and timing fixes (moved into Cores\Floppy to be used by CPCHawk in the near future)
• A new fluxdisk implementation, with converters from IPF, SCP, HFE, TRD & SCL
• Datacorder implementation updated and moved into Cores\Tapes to be used by CPCHawk in the near future
• Added turbo tape loading (non-deterministic only)
• Finished ZXHawk Pentagon128 implementation
• AY PSG accuracy updates. Moved into Cores\Sound for use in CPCHawk at a later date

Obviously, previous savestates are not compatible.

Check if completed:

• I have run any relevant test suites
• I, the commit author, have read the licensing terms for contributors (last updated 2024-06-22) and am compliant
  • Coauthored by Claude (Opus 4.6)

[YoshiRulz]

Where to begin... clearly I haven't enabled enough Analyzer rules. Non-exhaustive list:

• braces XOR single-line
• newline before =>
• space after cast
• go easy on the hand-aligned comments (/[ ]{2,}/ should not match your code)
• doc comments are HTML-like: you don't need to fold at 80 cols, and you can use line breaks and bullet lists
• use is with constant RHS
• coalesce subsequent checks into pattern matching
• s/for (;;)/while (true)/
• add a using statement instead of writing FQN
• use existing data structures and helper methods
• use LINQ; if it's too slow, write a helper method
• use {ReadOnly,}Span
• use u8 literal instead of casting UTF-16 chars
• use string interpolation
• omit type when assigning field/prop with new()
• use named arguments unless types make it unambiguous
• don't merge field/local declarations
• enable NRTs in new files
• why rename the Z80A type and namespace? just the namespace would suffice