It is currently possible to add additional / pre-configured activities to the activity chooser such as external services. We need to retain this ability.

• We need to finalise our implementation details
• Ensure backwards compatibility
• Unit tests must be included

User story

Acceptance criteria

• Mod activities can add one or more items to the activity chooser by implementing the new API
• Backward compatibility must be maintained.
  • If we create a new way of adding new items to the activity chooser then we must deprecate the old method.
    • Unit tests must be included with any new functions / methods.