Blink Detector State instead of / in addition to Events

[schtiefel]

It would be nice to have the Blink Detector plugin maintaining an internal "current blink state" (bool) instead of / in addition to only detecting the blink-related events (onsets, offsets):

• switch to true on (already implemented) blink onset events and
• switch back to false on (already impl.) saccade offset events

For cases in which the offset event was not detected (confidence increase not fast enough) other means are required to switch back, e.g.

• confidence value exceeds a fixed fallback confidence threshold
• confidence value increases by a fixed amount since onset (regardless of how fast)
• fixed amount of time has passed since onset, based on human physiological heuristics, i.e. average maximal blink duration

It would then be possible to "publish" onset and offset events in pairs.

[papr]

@fneitzel generously offered his help with this issue. I will assign myself as placeholder since I cannot assign him directly.