With the new version of Visual Studio bringing C# 12, we can revise our logic for better readability as well as use new methods/APIs introduced in the .NET 8.0 BCL.
Gift1: use IVs if required
Gift2: Enforce 0 TimeOfDay
Egg9: Require Egg Location to match encounter
PGT: keep requested gender in the event of antishiny
PGT: never yield Korean Ranger Manaphy for Format4
Simplify ushort range checks
Rename `EReader` bool to `IsEReader`
Extract Gender/Nature fetch for unfixed encounters
Remove Unown PIDIV branch when template has no Unown
Remove unnecessary loop for Pokewalker PID creation
We implement simple state machine iterators to iterate through every split type encounter array, and more finely control the path we iterate through. And, by using generics, we can have the compiler generate optimized code to avoid virtual calls.
In addition to this, we shift away from the big-5 encounter types and not inherit from an abstract class. This allows for creating a PK* of a specific type and directly writing properties (no virtual calls). Plus we can now fine-tune each encounter type to call specific code, and not have to worry about future game encounter types bothering the generation routines.
