Inline entity tiles

Inline Entity Tiles allow the engine to define a detail screen for a datum that is available persistently after the datum is selected. Additionally, the element can contain its own expanded detail set on-demand, allowing clinical and complex interfaces to more rapidly transition between selecting and interacting with a model.

X-Requested w/commcare and opendatakit-collect.

Relies on: Feature Flags
Can you drop this altogether, as it's no longer getting read?