added childControlNames and childControlIDs as properties of a group. This should simplify recursive iteration of stacks.
added childControlNames and childControlIDs to card and added controlNames and controlIDs to both groups and cards. The child variants don't recurse through the controls of any groups.
Merge branch 'feature/childControlIDs_childControlNames_of_group' of https://github.com/montegoulding/livecode into feature-childControl_props
Minor edits and added referencing comment (ChildControlProps).
Merge branch 'feature-childControl_props' into develop