Camera trigger

[bimac]

Logic for triggering the camera and initial delay has been moved out of the state-machines for ChoiceWorldSession.

• deprecation warning for custom tasks
• unadapted tasks fall back to old behavior
• documentation for adapting custom tasks
• incremented version number

[coveralls]

Changes unknown
when pulling a7fcb10 on camera_trigger
into ** on iblrigv8dev**.

[bimac]

[oliche]

The code is pretty clean and the pesky conditional on the first trial is gone.

The concern here is mainly about the extraction, and how having the first camera pulses outside of the the behaviour state machine start may affect the researcher facing data.

So happy to merge, but to release we'll probably need a plan with @k1o0 if there are any ibllib changes necessary, or at the very least to try on a canary rig first.

[k1o0]

The camera trigger should be removed from the habituation choice world state machine also