Gotek frame for external floppy drive case

This is a remix of the Gotek Floppy Case by NEMike.

What I changed:

• The four mounting holes on the bottom are extended to fit M3 screws.
• There is room for M3 nuts on the side of the frame, so the M3 screws hold firmly. This is required for external floppy cases that are held together just by the four bottom screws.
• The space for the OLED display was a bit too small for the display type I used.
• I also enlarged one OLED holder, and added a second one.
• The original Gotek case top cannot be used because of the OLED display, so I extended the front sides of the bottom frame a bit for optical reasons. The changed OpenSCAD source code is included.