Handle expandable footer, restore Control widget mapping.

Map tests were failing because some widget footers expand to allow for the possibility of imports.  The test then failed because clicking the "+ Control" in the footer would make the footer expand, rather than open up the mapping window.

This fix sets up a list of `EXPANDABLES` (currently only having "Control") that behave this way, and sets those object types to be navigated to differently (on mapping); they now expect the "expansion" animation, wait for it, and then click the usual "add" option.

"Control" option is also restored to widget tests.