Recording-specific hotkeys

[papr]

Starting with this PR, annotation definitions are stored in <recording dir>/offline_data/annotation_definitions.json with the format

{
    "version": 1,
    "definitions": {
        "<label>": "<hotkey>"
    }
}

This file can be shared between recordings.

On load, Pupil Player attempts to load the annotation definitions from the recording-specific file. If it is not found or invalid, it will fallback to the session settings, i.e. the last known annotation definitions.

[N-M-T]

This works a treat, the functionality is just what I would expect.
One condition where a user could lose their annotations hotkeys is if Player is closed via the terminal or crashes prior to a normal shutdown or new file load. I'm not sure that is such an issue