One MoveOperation to move them all

[scofalik]

(Follow-up to ckeditor/ckeditor5-engine#977)

At this moment, RemoveOperation and ReinsertOperation only very slightly differ from MoveOperation. Actually, it is just #type, #getReversed(). Additionally, ReinsertOperation has also #position but this is only used by deltas/deltas special cases and could be easily removed.

Additionally, in ckeditor/ckeditor5-engine#977, I introduced "move operation normalization". This means, that when any MoveOperation is transformed by MoveOperation, the resulting operation is not based on original operation's class but is taken from targetPosition and sourcePosition.

This all leds to conclusion, that RemoveOperation and ReinsertOperation are not needed. All we need is MoveOperation that automatically sets #type to a proper value, basing on targetPosition and sourcePosition.

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