Add support for Drops

[trezy]

User Story

As a game developer, I want to provide VHS endpoints and have test data sent to them, so that I can test my game's Drops without exposing the fact that I'm working on them.

Acceptance Criteria

• I can add VHS endpoints to fdgt via the web UI
• I can add my game to fdgt via the web UI
• When I use the chatter command, test data is sent to my VHS endpoint(s)

Prerequisites

• Depends on #17

Other Notes

Drops documentation