Controls UI - Move 'add controls' to popup menu

Add a new popup menu for add/edit/settings. Start with just
add. Change colors of the popup background to match specs. Hide drop
down structure switching if there's only 1 option

Bug: 151142664
Test: visual

Change-Id: I3077d2eda020e8f1ddd03eda343b062f90ee412b
7 files changed