ONSET_INSET_OFFSET_ERROR renamed -- need support for Duration and Delay validation

[VisLab]

The ONSET_INSET_INSET_OFFSET_ERROR has been renamed TEMPORAL_TAG_ERROR in the HED specification so that Duration and Delay errors will fall under this umbrella.

What is the status of validation for the Duration and Delay tags beyond the top-level-tag group? How is the requirement that at most one Duration and one Delay can be in a tag group being handled?

Ref: PRs hed-python#879 and hed-specification#567.

[happy5214]

There is currently no specific support for validating Delay and Duration groups. I have opened #141 for that.

[VisLab]

Renamed TEMPORAL_TAG_ERROR to generalize.