Custom "render" messages are inconsistent

[mfreidel]

Overview

The contents of the custom "render" OOB messages are somewhat inconsistent and poorly implemented on the server end. This is primarily due to implementing them with little to no planning or documentation. The server-side code must be changed to send more consistent render messages, and the client must be modified to handle these changes. Further, these changes should be planned and documented in the wiki here on GitHub.

Requirements

• Fix problems with server code
• Handle changes in client
• Write documentation