Error boundaries

[aleclarson]

Objective: Add the ability to capture component rendering errors higher up in the component tree and provide a fallback component (i.e. an user-facing error screen).

Proposed solution: Add an <ErrorBoundary> component that sets a fallback property on itself. When a descendant throws an error while rendering, it can search up the component tree until a component with a fallback property is found. If none is found, the descendant will instead render nothing (and its hook memory will be dropped?).

Additional details

• An error boundary is not required to have a fallback. If none is provided, the error boundary defaults to replacing its children with nothing when a descendant throws an error.