Upgrade usvg from 0.9 -> 0.20

[kognise]

Upgrades usvg to 0.20. Had to make some minor code changes, the main differences are:

• Tree constructors now take an OptionsRef instead of an Options, so we need a bunch of .to_ref() calls
• Tree::from_file was removed, I replaced it with Tree::from_data and std::fs::read

[kognise]

Just realized #487 does mostly the same thing, I didn't notice since it has a different name. I believe my changes fixed a couple more things than it, but I'm not 100% sure.

[floppyhammer]

@kognise The focus of #487 is to fix the Android demo. So, I don't mind rebasing that on your commit if yours does more fixes. In addition, I've got a little question. Is it necessary to commit Cargo.lock?

[kognise]

A rebase might be a good idea, up to you. As for Cargo.lock, everything breaks if we don't commit it so I think it's fine. Has the potential to cause merge conflicts though, so I'm not 100% sure.

[bors-servo]

☔ The latest upstream changes (presumably #491) made this pull request unmergeable. Please resolve the merge conflicts.

[floppyhammer]

@kognise Do you have any time to work on this?

[kognise]

Sorry, I'll try to handle it by Monday at the latest.

[kognise]

Trying to get these PRs working... I'm stuck on an M1 MacBook right now, which is normally a blessing!

I'm having trouble with the winit versions depended on— neither 0.21 nor 0.19 will build on aarch64 as the objc crate introduced some breaking arch-specific type changes (an i8 to a bool, but only on M1). This has been fixed on the latest version of winit (0.24.0) but I'm struggling to navigate the dependency nightmare.

Even after upgrading Winit in all of Pathfinder, Surfman still depends on the older version. What's the best way to handle this? Should I make a PR to Surfman and wait for that to merge, then come back here?

Thanks!

[floppyhammer]

@kognise It seems the mismatched types issue already exists on the current master. It might need another PR. See #483.

[floppyhammer]

I'd like to combine changes from this PR into #487 if you don't mind. As as result, this one will be superseded.