administration.lua: everything's better; automatic migration.
database.usernames -> database.users. View with /me.
Nicks and lastfm usernames moved to database.users; auto migrate.
Adds self-hosted, single-realm administrative functions to otouto.
Check out the README for a detailed description.
Also added msg.from.name, which is msg.from.first_name + msg.from.last_name (if it
exists), because I'm too lazy to build it each time.
Fixed a crash-causing bug (ironically) in the handle_exception() function.
When an exception is caught, info will be printed to the config.log_chat or the console.
/preview will give an "unlinked" preview for the link.
youtube.lua now uses config.google_api_key.
youtube.lua now uses unlinked previews.
lastfm.lua gives more informative error messages.
New utility: handle_exception().
Usernames seen by the bot are now cached in the $usernames table. To get the ID associated with a
username, use the resolve_username() function from utilities.lua.
The table_size() function in utilities.lua will tell you the number of items in a key/pair table.
about.lua no longer displays a link preview in the about message.
currency.lua now accepts decimal arguments for the amount.
luarun.lua now correctly displays "false" return values.
moderation.lua will no longer send "I do not administrate this group".
Redone README to match the website.
Bot now supports deep linking / start payloads.
lastfm.lua now notifies a user when his default username is saved.
antisquig is now part of moderation.lua.
Everything reworked and rewritten.
Antisquig is now a plugin to work with moderation.lua.
The bot can now upload photos, stickers, and other files.
Return values in plugin functions to affect the bot's behavior.
All this and more!
