WordTutor update

WordTutor has been updated to address a few issues reported - thanks for the feedback.

This release includes:

• Added guidance to the Modify Wordlist screen

• Added version number to the About screen

• Fix for blank words in a saved wordlist

• Fix for sorting of wordlists on the main screen

• Fix for inability to move the Wordtutor window when not maximized

• Fix for incorrect behaviour during drill when no attempt has been made and “Enter” is pressed