Groupboxes for Options window.

[DrewNaylor]

• "Search Behavior"
  This has groupboxes for "When to search" (Search on Enter or Search when typing) and "How to search" (Beginning of text entry or Anywhere in text entry; see Search anywhere in InnerText or search beginning of InnerText. #1)
• "View + Formatting"
  Has groupboxes for both UI stuff (the "View" groupbox) and output text formatting (see Allow the user to change output textbox font size. #4)
• "Entity File Location + Updates"
  Contains a groupbox for updating the entity/character code XML file (the groupbox in the Options window now) as well as one to choose to use a built-in (My.Resources) one, one next to the program, one updated from the Internet, or one from another folder (see Fall back to a built-in version of the XML file if it can't be found in the current directory. #2 and Keep online update versions of the XML file separate from the version that html-ccap ships with. #3).