Framework Mainboard Case with Separate Power Button

Draft modified version of the Framework Laptop Mainboard case with a separate power button instead of an embedded one. Based on STLs at https://github.com/FrameworkComputer/Mainboard, used under CC BY 4.0. Thank you, awesome Framework folks!

The button in this revision is separate instead of printer as an integrated component. I thought the benefits would be:
* less work to repair than an integrated button if the button breaks
* less likely to cause problems between different filament types (less flexible ones)
* easier to customize/remix
- especially if you're like me and only have Blender - less topology to mess up
- easier to print different colors
- don't need to re-print the whole top case if you just want to swap the button

The button is beveled to keep it from coming out the top of the case. There's also a version with a keyhole for designs where the button should not freely rotate.