Maxwell's puzzling demon v1.4.8

Levels update

• Fixed 2-D, 3-A, 3-B, w7?₆, 9-17 and 0-μ to prevent unintended solutions.
• Rearranged levels in w2 and add new level as 2-9 to adjust difficulty.
• Changed 9-24 to adjust difficulty.
• Adjusted the appearance of some levels.