Magenta screen on Apple Silicon

[hdevalence]

Following on from #10 / https://github.com/fintelia/terra/issues/10#issuecomment-759888427 (but with a new issue since this seems to be a different problem), after getting Terra to launch on an M1 Macbook using --features soft-float64, I get a solid magenta screen.

[fintelia]

Hm, this might be trickier. A couple ideas that might narrow down the issue:

• If you can get Terra running in a graphics debugger that would probably provide the most information. I don't think RenderDoc works on macOS, but looks like there's a Metal Debugger that might?
• Try commenting out these lines that do the actual rendering, maybe the window will change color? https://github.com/fintelia/terra/blob/30ebe19667db95dbe185e605124ed897b9b73809/src/lib.rs#L418-L426
• Conversely, maybe the render function isn't being called at all. If you add a println to that function does it get written to the terminal?