Feature request: Autosplitter Settings per Split, access settings for Current Split

Allow ASR auto-splitters to set up settings widgets, that allow the user to choose different settings for each split they have.

While the user has the settings editor open, allow the auto-splitter both read and write access to the settings for all splits, or at least the split that the user is currently editing, if the interface restricts the user to only edit one at a time.

During a run, allow the auto-splitter read access to the settings that the user had set for the Current Split.

Various versions of this have been proposed on Discord by DarkRTA, Tedder, and probably others.

Start by locating the autosplitter settings interfaces and the code representing the settings editor and Current Split. Review the prior Discord proposals and existing access boundaries; done requires a decided design for per-split widgets and read/write access during editing and runs.

Written by the indexing model from the issue text.