added setting lockUpdates of group to improve performance when setting many properties of objects within a group
Merge branch 'feature/lockUpdates_for_group' of https://github.com/montegoulding/livecode into feature-lock_updates_of_group
[[ GrpLckUpdates ]] Added referencing comments.
[[ GrpLckUpdates ]] Moved 'lockUpdates' token to correct place in sorted list.
[[ GrpLckUpdates ]] Minor formatting tweaks.
Merge branch 'feature-lock_updates_of_group' into develop