Fix typo
- Fix typo
Add support for Label and LabelSet in annotations

- Add support for Label and LabelSet in annotations.
Add sample JSON files for author created labels

- Add sample JSON files for author created labels.
Check 'labelSets' existence in sequence

- Check 'labelSets' existence in sequence.
Update runtimeSchema for Label and LabelSet

- Update runtimeSchema for Label and LabelSet.
Fixes for LabelSet and Label

- Fix 'offset' fetch for Label.

- Fix 'labels' array for LabelSet.
Refactor code for Label and LabelSet

- Refactor code for Label and LabelSet.
Cleanup code

- Cleanup code.
Add support for label in 'PickAPointSequence'

- Add support for label tool and annotation in 'PickAPointSequence'.

- Add Sample json files for 'PickAPointSequence' with label.
Compile after rebase changes

- Compile after rebase changes.
Add 'allowCoordinatesChange' in 'Labeltool'

- Add 'allowCoordinatesChange' to specify whether label co-ordinates
  can be changed or not.