Support event driven architecture/framework

[meetrp]

Using multi-threaded application could result in thread-explosion. Additionally the overhead of creating, maintaining & cleanly destroying a thread can be avoided for a short-lived actions. Finally, the 'actions' are all based on a trigger so an event-based architecture is an appropriate fit.

Acceptance Criteria

• framework should have support in both py2 & py3 versions.
• framework should have strong long-term support
• framework should have cross-platform support. (optional)