Fix an issue where the lag meter would be stuck after a reconnect caused by a
ping timeout.
Use png instead of svg
Improve sort keybinding in servlist

also disable auto sorting on fav channels, closes #606
Python: Allow unhooking commands and prints by name
Merge pull request #603 from orium/lag-meter-stuck

Fix an issue where the lag meter could get stuck after reconnect
Passing a password to the /server command was ignored because the login method
was not set.
Merge pull request #618 from orium/server-command-password-fix

Fix issue with /server command