Insta360 One X2 skeleton lens protector

Inspired by [this thingiverse print](https://www.thingiverse.com/thing:4722985) that covers the basic One X2 camera, this version works when the [utility frame](https://store.insta360.com/product/one_x2_utility_frame) aka metal cage is installed.

This is designed from scratch, just inspired by the other one. I haven't designed it to have a very wide base, though it'll work to hold the frame and camera upright when the bottom tabs are folded in.