Speed up akill xline checks

Cache xline nick, user, host, etc instead of rebuilding it everytime its
requested. Store users ip in sockaddr form and not string form to
prevent having to rebuild sockaddrs when checking xlines.

Also do not try to convert empty config values in Config::Get as this
can be rather common if a non string configuration value is not set, and
the cost of the ConvertException is great.
Fix extra space in log messages with logtype channel and no source
Core prep for p10 stuff
Fix deflanguage from 4034b3054aaff28da1db5545063cf8b3c2e8aa24, this shouldn't have been removed
Make command group descriptions translatable.
Regenerate french language file.
Update french language file.
Merge pull request #79 from Jyzee/langFR-Patch

Make command group descriptions translatable.
Updated italian language
Merge branch 'it_IT' of github.com:H7-25/anope into it_IT