Avoid array usage to store disappearing transitions on beachsection removal #32
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When a beachsection is removed, the original implementation creates an array and stores all "disappearing transitions" in it, so that the starting points of their edges can be updated.
This PR changes the removeBeachsection method so that endpoints are set when cycling through the disappearing transitions the first time, avoiding the creation of this new array, and reducing the amount of time spent on garbage collection because of this.