Fix issue with name normalization by assuring that the id/name lookup always uses composed strings. Remove the now-unused function in the Adium bundle.
Do not depend on buddy list entries when looking up the ID from the user name, by maintaining a bi-directional mapping ID <-> username. Rename functions to make them more evident as something that operatos on the lookup. Cleanup blist functions by implementating generic iterator function over account buddies.
Do not assume that a name for each ID can only be set once anymore.
Remove assertion that names always exist, return 0 instead and propagate
error handling to the calling function.
Do not update blist buddy names, but set an alias instead to prevent breaking conversations or loosing history. Instead, keep the first print name as permanent user name
and set the alias on all buddy name changes. When interacting with purple always use the original buddy name stored in the blist instead of the print name provided by libpurple.
This allows both, meaningful names in group chats and permanent identifiers in the buddy list, while still propagating names changes to the interface.
Use print names instead of ids as usernames, to fix problems with "useless" user ids showing up for unknown users and in group chats. Remove workarounds like "Telegram Foreign" needed to temporarily store user names for alias resolution.
