fix ChatroomSource

Signed-off-by: xiehuc <xiehuc@gmail.com>
fix receive chatMsg

Signed-off-by: xiehuc <xiehuc@gmail.com>
fix dont' find buddy

Signed-off-by: xiehuc <xiehuc@gmail.com>
fix SentChatMsg type

Signed-off-by: xiehuc <xiehuc@gmail.com>
add send Chat Msg

Signed-off-by: xiehuc <xiehuc@gmail.com>