This will allow the addition of custom parameters to a second anchored window.

"Conversation ID" and "Force local preview" are implemented.

Change-Id: I2366b57e6bb36efb568b06e40ef124a440a39397

This is a WIP and is intended to be adapted continuously to support more and more UI elements and reduce the time spent debugging components.

Some components will require additional configuration (e.g. the conversation ID must be set), which may require additional changes.

Change-Id: Iaa5d49693f874202439e746a274da4911adf7d15