OnDblClickCell event on TTMSFNCGrid

Adding on OnDblClickCell event to the TTMSFNCGrid would be more convenient and would make it more consistent with the TAdvStringGrid.
This event would have the advantage of passing the cell row and col indexes when a grid cell is double clicked.
Currently (TMS FNC UI Pack v3.5.2.1), TTMSFNCGrid component only has an OnDblClick event where the mouse coordinates should be converted to the grid cell coordinates.