Puzzle Match 4

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Some bugs are fixed.
Game difficulty are rebalanced.

Every-mode decrease chance of creating a spirit every time the level is increased.

Normal-mode changes from 7 to 5 kinds of stone.
When reaching 51 level,
the probability of creating a spirit is fixed at 50%.

Hard-mode changes from 7 to 6 kinds of stone.
When reaching 51 level,
the probability of creating a spirit is fixed at 60%.

Expert-mode
When reaching 51 level,
the probability of creating a spirit is fixed at 70%.