Add messages for all special message types

[andmcadams]

When receiving new messages, a preview appears in the chat button corresponding to that chat. The object replacement character is given as the body in cases where the message is not simple text, like when a video or picture is received.

[andmcadams]

iMessageForwarder/localCode/chatframe.py

Line 102 in d3da9a2

# TODO 4: Need to grab the type of message and set the text to that. Perhaps this should be implemented on message load.