Tracker.cs rework

[Vivelin]

Tracker.cs is getting kind of chonky. In additon, now that there's multiple ways of tracking things and clearing locations, there needs to be some consistency.

My suggestion is to identify and split up several core tracking functionalities into services, e.g. an Item service for tracking and untracking items, and a Location service for clearing locations.

Tracker.cs will likely still contain the main methods that are called from the voice commands, but the UI will have the option between those and more fine-grained control using the services (but still remain consistent with the rest of tracker).