Refactor: move files to packages; break out QuickGroupMenu class.
(This was a start on an idea to make it easier to organize my thought on how to help
our children individually, & related planning.)
Allow inserting an existing entity into a group, at a specific location in the group.
And some refactoring that helped, or clarified.
(I.e., continuing the idea to make it easier to organize my thought on how to help
our children individually, & related planning.)
(And fix or remove some tests I've ignored for a while now due to needing features quickly:
color and jline2.)