[MODDING] Allow detecting GetKeyDown & GetKeyUp in the OnPlayerClicked callback

[Khanx]

If possible I would like to be able to detect the GetKeyDown/Up in the OnPlayerClicked in order to know WHEN the player starts clicking with the mouse and when finishes.

[pipliz]

Added to #322 Though you'll only have OnMouseDown / OnMouseUp equivalents, no "OnHoldingMouse" every frame the player holds it