CORE-06: component - component lifecycle manager

[tendrils]

• define component class descriptor
• define command/event control language
• define state transitions and events
• implement generic component driver:
  -- lifecycle models: cycle/linear/stateless (?)
  -- handler for API bootstrap routine, to load component without an existing manager
  -- component-loader code which uses core component API to interact with components

broad acceptance criterion: example project builds and runs