Rewrites a good amount of legality APIs pertaining to:
* Legal moves that can be learned
* Evolution chains & cross-generation paths
* Memory validation with forgotten moves
In generation 8, there are 3 separate contexts an entity can exist in: SW/SH, BD/SP, and LA. Not every entity can cross between them, and not every entity from generation 7 can exist in generation 8 (Gogoat, etc). By creating class models representing the restrictions to cross each boundary, we are able to better track and validate data.
The old implementation of validating moves was greedy: it would iterate for all generations and evolutions, and build a full list of every move that can be learned, storing it on the heap. Now, we check one game group at a time to see if the entity can learn a move that hasn't yet been validated. End result is an algorithm that requires 0 allocation, and a smaller/quicker search space.
The old implementation of storing move parses was inefficient; for each move that was parsed, a new object is created and adjusted depending on the parse. Now, move parse results are `struct` and store the move parse contiguously in memory. End result is faster parsing and 0 memory allocation.
* `PersonalTable` objects have been improved with new API methods to check if a species+form can exist in the game.
* `IEncounterTemplate` objects have been improved to indicate the `EntityContext` they originate in (similar to `Generation`).
* Some APIs have been extended to accept `Span<T>` instead of Array/IEnumerable
* Reuses move parse result objects for each encounter parsed in a LegalityCheck attempt, instead of creating a new object.
* Ensures the objects are never-null, and makes cleanup easier.
Slightly adjusts some other parts of the moveset validation to reduce allocations.
* Initial bred moveset validation logic
Unpeel the inheritance via recursion and permitted moves
* Volt tackle considerations
* Optimize out empty slot skips
* Add tests, fix off-by-one's
* Require all base moves if empty slot in moveset
* Add test to prove failure per Anubis' provided test
* Tweak enum labels for easier debugging
When two enums share the same underlying value, the ToString/name of the value may be either of the two (or the last defined one, in my debugging). Just give it a separate magic value.
* Fix recursion oopsie
Also check for scenario where no-base-moves but not enough moves to push base moves out
* Add Crystal tutor checks
* Add specialized gen2 verification method
Game loops through father's moves and pushes in one iteration, rather than checking by type.
* Add another case with returning base move
* Add push-out requirement for re-added base moves
* Minor tweaks
Condense tests, fix another off-by-one noticed when creating tests
* Disallow inherited parent levelup moves
Disallow volt tackle on Gen2/R/S
* Split MoveBreed into generation specific classes
Gen2 behaves slightly different from Gen3/4, which behaves slightly different from Gen5... and Gen6 behaves differently too.
Add some xmldoc as the api is starting to solidify
* Add method overload that returns the parse
Verify that the parse order is as expected
* Add reordering suggestion logic
Try sorting first, then go nuclear with rebuilding.
* Return base moves if complete fail
* Set base moves when generating eggs, only.
* Use breed logic to check for egg ordering legality
Don't bother helping for split-breed species
