function ItemDragRelease(item) {
    this._item = item;
    this._isActive = false;
    this._isDestroyed = false;
    this._isPositioningStarted = false;
    this._containerDiffX = 0;
    this._containerDiffY = 0;
  }
The release process handler constructor. Although this might seem as proper
fit for the drag process this needs to be separated into it's own logic
because there might be a scenario where drag is disabled, but the release
process still needs to be implemented (dragging from a grid to another).

@class
@param {Item} item