Like it's already implemented in irc plugin, this commit adds the /ignore command. Now you can filter messages in group chats to not be shown, based on a part of Tox ID. The ignore list of IDs is manageable in this way:
[tox] /ignore list
add <ID part>
del <ID part>
ommit messages from people with certain Tox IDs
list: show the list of ignores
add: add an ID to the list
del: delete an ID from the list
This will add separate "tfer" buffer with all necessary controls for
managing files and /send command to start transfer, which you can use
either from profile buffer or from private messages buffer; in case of
incoming files the buffer will be created as well if doesn't exist yet.
Every callbacks were defined according to the specification and this
implementation is fully corresponding to the documented behavior including
streams.
