Various changes. See description.

* Updated preferences user interface to add consistency between several user interface elements. Mainly, all elements now share the same 12 pt font size.
* Removed preference for batch log file writing. The behavior of this preference has never been consistent. It is best that it is gone.
* Added a new Advanced tab category in Preferences labeled “Incoming Data” — several existing preferences have been moved there.
* Added new preference under the Incoming Data category that blocks Zalgo Unicode spam. This preference is disabled by default.
* Moved preference to include user mode part of inline nicknames to the advanced tab of the style preferences.