Added /otr to /help chatting
Removed unused otr callbacks
Moved otr autocompletion to function
Added contact autocompletion to /otr start <contact>
Open new chat win, or use existing for /otr start <contact>
Implemented /otr start <contact>
Check for already established but not used OTR session on /otr start <contact>

For example, one may have been established from the other end, without
any messages being sent yet
Fixed GString freeing before use in otr.c
Added setting /otr log on|off|redact
Implemented chat logging options for OTR messages

on - Log OTR messages as plaintext
off - Do not log OTR messages
redact - Log, but replace the text with '[redacted]'

Defaults to redact
Removed dirty flag from titlebar
Renamed title_bar_title -> title_bar_console
Renamed title_bar -> win
Renamed title_bar_set_status -> title_bar_set_presence
Renamed title bar status -> presence
Removed title_bar_show from UI module
Removed _title_bar_show
Added _title_bar_draw_title when setting presence
Always erase and refresh titlebar when drawing
Use title_bar_draw where possible in title bar