Add alternate curved parentheses with smoother curves

[vl4dimir]

The soon-to-be-official u0028-rounder and u0029-rounder alternates are almost perfect, but their curves are messy. This is obvious at larger sizes, but also when viewed on a high DPI (i.e. Retina) screen if you have a sharp eye.

Here's my take on it:

And here it is overlaid on top of u0028-rounder and u0029-rounder:

You can see the orange parts sticking out, which are to my eye superfluous. Here's a side-by-side comparison (my mod is blue, the soon-to-be-official is orange):

Is it just me, or are these annotated regions (in red) appearing thicker than they should be?

Anyway, didn't want to complain about it in the Hack repo, so I rolled up my sleeves and fixed it. 😉

[jdw1996]

Thanks for continuing to iterate on the design. These changes look good to me at high resolution, but do you think you could post screenshots at a smaller font size, more like what would be used in code?

[vl4dimir]

@jdw1996 Sure! Here's a couple of screenshots.

Honestly I still feel these would look better if the ends of each stroke were perpendicular to the shape, @chrissimpkins suggested this back on the PR for the round parens. I might do another alternate version soon.

[chrissimpkins]

Changes look good Vladimir. Thank you very much for working on this! Joseph submitted these in Hack as new defaults and I think that we should be having this discussion on the Hack repository. Let's take the discussion there. Please make sure that you are working off of the design files in the dev branch of the Hack repository where the current versions of the designs reside. These changes are currently part of this PR source-foundry/Hack#427

We can build fonts with these designs and take a look at them.