Min-/Max Quantites for WooCommerce

Added Woo­Com­mer­ce set­tings panel for easy con­fi­gu­ra­ti­on.

Enab­led vali­da­ti­on during add-to-cart pro­cess.

Added glo­bal min/max quan­ti­ty set­tings.

Added pro­­duct-level min/max quan­ti­ty set­tings.