irc/quassel: update to 0.14-rc2 release (+)
Switch to author's provided src tarball instead of GitHub auto-generated.
Changes since -rc1:
- Don't silently fall back to unencrypted client/core communication if certificate cannot be loaded
- Properly escape LDAP usernames to prevent injection or bypassing authentication
- Strip format codes in ignore list rules (this might affect pre-existing rules)
- Improve window handling under Wayland
- Update bundled iconsets and application icons
- Update default network and documentation to point to our new home Libera IRC (since Freenode killed itself)