Mods for Mini12864 case

I made 3 changes to the great mini12864 LCD case by Voxel3D_Netherlands to adapt it to my board and my printer (Longer LK4 aka Alfawise U30, installing the mini12864 instead of its stock touchscreen for using with Klipper firmware):

1. Fixed design of the mount bracket to avoid it interfering with the on-board SD card slot (increased a cut-out);
2. Extended the main body with a mount plate for communications breadboard (took a prototyping board and soldered connections for mini12864 and STM32 Blue Pill board to it). (Also can be used to solder a breakout for 40-pin 0.5mm pitch FPC cable from the stock display, that way you'll be able to connect mini12864 and some other stuff to the Longer LK4 mainboard)
3. Designed a custom mount plate to attach this case to the end of horizontal 2040 extrusion rail.