Mr. Mustachio : #100 Rounds

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- There are now two Daily Challenges. The first one would be a subset of all the different types of grids (same as the existing). The second one would always be a math grid challenge. For the people who love their pluses and minuses, there is a daily challenge now. And this challenge will also sometimes have the 4x4 grids (just to make it even more challenging).

- Top 10 Leaderboard for the Daily Challenges also added.

- Added/Removed/Tweaked a few rules.

- Minor fixes.