This struct represents a chatbot that is connected to a given ship,
is watching/posting to a specific chat_ship/chat_name
and is using the function respond_to_message to process any messages
which are posted in said chat.
A struct that represents a message that is to be submitted to Urbit.
Message provides methods to build a message in chunks, thereby allowing you
to add content which needs to be parsed, for example links @p mentions.
It is technically an alias for the NodeContents struct.