Rework Mask module

[rowanwins]

This PR reworks the mask module to be much simpler.

It's a bit slower on some of the tests (like surprisingly so) although I haven't quite dug into why deeply, it's most likely something to do with the union operation being called when it probably doesn't need to be.

This work was originally included in my v7 branch.

Resolves #1944
Resolves #1917
Resolves #2054
Resolves #1454

Before

basic x 2,037 ops/sec ±1.93% (85 runs sampled)
mask-outside x 1,652 ops/sec ±1.99% (86 runs sampled)
multi-polygon x 4,630 ops/sec ±2.89% (81 runs sampled)
overlapping x 12,926 ops/sec ±1.76% (93 runs sampled)

After

basic x 4,627 ops/sec ±25.23% (21 runs sampled)
mask-outside x 3,892 ops/sec ±34.80% (15 runs sampled)
multi-polygon x 5,837 ops/sec ±3.03% (91 runs sampled)
overlapping x 22,326 ops/sec ±1.34% (90 runs sampled)

[mfedderly]

lgtm. Its a little weird that the meat of this lives in another repo. It introduces this issue where polygon-clipping depends on turf which depends on polygon-clipping, and that has the turf deps pinned at 5.x which is not great, but we already depended on this exactly polygon-clipping apparently so it isn't making things worse.

[mfedderly]

🥇 I AM SPEED

[mfedderly]

turf deps pinned at 5.x

Huh this is actually just devDependencies so we're good. There was another package somewhere that had the old turf libraries as actual dependencies.

[3zzy]

@mfedderly Thanks, finally! Just wondering if there's going to be a an actual release anytime soon?

[mfedderly]

I'm probably not going to get to it in the next few weeks but maybe @rowanwins has some time.