Bugs fixed. Convinient function added. #4
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There was two bugs:
-one appeares when one tries to Get or Remove from empty list. (prevs function returns empty slice in this case, and there wasn't a check for this before prev[0] indexing)
-the other appeares when one tries RemoveElement with a key, which have several elements in the list. (infinite loop because of changing copy of variable)
Besides there was a lack of Insert function that returns the newly created Element (issue #2 )