Improve String Input Fields for Filters

Added new classes to fields.py which support multi-lined, wrapped, text input.
Added keywords for changing text field width, lines, and default value in filter.py
Removed strValSize, strVal, and strSize optionNames from filter.py

Video with more info: http://youtu.be/u5r7bjT7AX8
Filter for testing: http://www.mediafire.com/?2h4w555gtm8eofz