Pixel 6a geometric TPU case

Remix of dude6935's Pixel 6a case.

- Fixed the USB cutout placement, now I can actually plug my cable in
- Improved the power/volume button placement and added a small tactile cutout between the volume buttons
- Drastically shrunk the camera bar cutout holes so the bar is better protected
- Filled in the open back for better protection
- Gave the edges a more geometric profile
- Reduced the lip on the top (since I use thin plastic screen protectors instead of glass ones)

Printed well for me at 0.2mm without supports.