v0.9.16: "Reset" workflow and dependency updates

This is a minor release that adds ability to wipe out workflow state (very useful during workflow development) by removing all messages, log records and agent memory with a single button (and confirmation dialog - just in case).

Heroku specific support was removed, as "demo" mode is no longer possible (no free tier) and production deployment will require custom configuration anyway (you can still deploy to Heroku, though).

Multiple dependencies were updated.