This extension is useless without Echo, and the API modules already
disable themselves if it's not installed. Just absolutely require Echo
to be installed.
Change-Id: I653eea78668bfe0875bc5a33e2d45607106d4ee5
Core change I8d825eb0 begins the process of changing core database
tables from using xx_user and xx_user_text fields to using xx_actor.
This updates the extension to continue to function during and after the
transition.
Bug: T167246
Change-Id: Ib84a5a7a9f80fa321f7482d4c27c5f58add47230
