* Refactor `Vec2f`, `Vec3f`, `Vec3s` in `z64math` to avoid reserved identifiers.
* Include `z64save` in SaveManager, which requires encapsulating `#include gameplaystats.h` and `InitStatTracker` in the cpp to fix compile issues.
Adds SaveContext reference parameters to SaveFunc and existing implementations in preparation for threaded saves.
* Threaded saves fully implemented.
Platform-specific save code removed.
Thread safety added. Will wait for thread pool tasks to finish before resetting or closing.
* Converted gSaveContext copy for save threads to the heap with `new`, deleted at the end of the threaded function to prevent possible issues with the stack.
* Turns out leaving the call to `ThreadPoolWait` in a `GameInteractor::OnExitGame` hook seems to be just fine.
* Removed unnecessary references to `SaveManager::ThreadPoolWait()`, game hooks are the only places it's called now.
* Re-added WiiU/Switch performance save code.
* Added call to `SaveManager::ThreadPoolWait` in `Sram_InitSave` to prevent trying to load a newly "created" save before the save file was actually written.
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Co-authored-by: Christopher Leggett <chris@leggett.dev>
