feature 3 Robots can't place on water #10
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This merge need the update in the pull request #6
Robots cannot be placed in water, or on top of another robot.
If the bot can't move into the water, then it can't place in water.
TODO: the bot can only move in the water cannot place in the land.
Suggestion: Need more states of waterAble, we can use 0 for land only, 1 for water only and 2 for amphibious.