Word Whip 4.0 - more puzzles & UI improvements

In this update:

• A new page of puzzles (Bonus 3)
• UI improvements
• Puzzle 15 has been changed as it was too similar to Puzzle 5
• Word requirements have been reduced in some later puzzles

NOTE: uploaded a new build (4.1) on July 7 2022 to fix the Windows version crashing on minimize.