Tarantula Pro 350W PSU

This is a cover to enable the use of a 350W power supply in the Tarantula Pro and incorporate Auto Switch On and Off using the M80 command in the startup script & M81 in the end script.

A 2mm strip needs trimming off the RH edge of the power supply from the front to the edge of the top cover (About 15mm long). This is to prevent the PSU/Cover fouling the Y end stop assembly.

The relay unit used is a 5volt module from Aliexpress :- https://www.aliexpress.com/item/32719754159.html?spm=a2g0o.productlist.0.0.34216b45P8HoiR&algo_pvid=fda806d1-7a9d-463c-8f96-85253a2a8c0b&algo_expid=fda806d1-7a9d-463c-8f96-85253a2a8c0b-1&btsid=4dceafa8-fb5a-44c7-938e-e08c924da2bc&ws_ab_test=searchweb0_0,searchweb201602_10,searchweb201603_55

The following was added to pins_MKS_GEN_L.h (If your board is defined as the MKS GEN L in Config.h)

// Define the Power On pin // Added by Jim Wolstenholme
'#define PS_ON_PIN 5 // Added by Jim Wolstenholme' (Quotation marks only there to make this