[Azoth OTRoid] Use UTF-8 length of the auth reply.

Fixes authenticating with non-latin secrets.
[Azoth OTRoid] Better code style.
[Azoth OTRoid] Display notification on successful OTR auths.
[Azoth OTRoid] Visually accent IDs in auth dialogs.
[Azoth Xoox] Added new caps for isida bot.