Initial support for mobile devices

[j-f1]

No editing yet, but UI looks nice and you can open the canvas menu

Does not fix #138

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[j-f1]

[j-f1]

One issue is that the color picker doesn’t look too good because it doesn’t flip to point up:

[j-f1]

Looks like tests are failing because I’m using matchMedia, which isn’t supported in the test environment. What should I do?

[lipis]

Maybe the easier to remove the test until we figure out how to test it properly.

[vjeux]

Nice, thanks so much Jed!

I think we should merge this in first, and do all the gesture handling in a second PR.

Code looks reasonable.

[j-f1]

I’m about to merge in cryptobias#1 so it’ll at least function.

[j-f1]

I’ve given up on getting touch to work now, this should be good to merge

[j-f1]

Testing was carried out on iPhone 11 and iPhone SE simulators. Safe areas (for rounded corners) work as expected, and both portrait and landscape look good.

[vjeux]

Thanks!!!!