Fix/Incorect svg arc parsing

[Calabaraburus]

Current version incorrectly imports paths of svg file if path contains arcs that can't be split on 90deg segments

svg: https://yadi.sk/d/bCYLumnmJbLhgg

Original svg image:

Importing to OpenToonz:

After fix:

[ghost]

Thanks a ton. SVG definitely needs some love.

[RodneyBaker]

Thank you @Calabaraburus.
I tested the appveyor and it works as described.

As @turtleTooth stated, the attention on SVG is appreciated.

Aside: The most obvious issue I see with SVG at this point is the improper scaling upon import.
I'm not sure if it's DPI related but that seems to be a likely candidate as SVG being a vector format it doesn't have a DPI setting. With OpenToonz possibly factoring DPI in for initial resolution that might make the difference.

Added: One thing I note with this addition is that Control Points appear to be kept to a minimum. Nice!

[artisteacher]

Thanks @Calabaraburus for tackling svg! I was testing with one of my own svg & found there is still some visual distortion.

This svg should look like this:

But looks like this:

There are actually 3 issues here - the slight distortion in the shape, the stroke issue is reported in #1009, and the missing fill in #1795, #119.

test.svg.zip

[shun-iwasawa]

Jenkins

[shun-iwasawa]

It works fine. Thank you @Calabaraburus for the fix! LGTM

[RodneyBaker]

Watching this as the code is said to be merged but haven't been able to confirm the fix yet in a nightly build.