PacMan clock case V2.0

- Re-designed the cradle to be less snug on the clock module and the Arduino Mega

- Added screw holes and screw nut holders to the bottom and sides of the case.

- Tweaked the side panel guides so that the top cover fits better.

- New code on GitHub for a generic Retro Arcade clock
https://github.com/bonnette/DK_Clock

Used 10mm M3 screws and nuts from Amazon
https://www.amazon.com/gp/product/B071NLDW56/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
and
https://www.amazon.com/gp/product/B011BNSW1I/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

The design was created using FreeCad 0.17 (Thanks FreeCad !)