Refactor SVG path parser to accept scientific notation

[Junology]

Refactor PShapeSVG.parsePath() so that it now accepts SVG with coordinates in scientific notation such as 3.14e-2.
It fixes #870 (and #816 too?).

I added a test case, but I am afraid it may not be enough.
In particular, the behavior of the function might change to some extent especially for 'ill-formed' SVG paths.
Please let me know if you have good test cases.

Thank you.

[Stefterv]

Tested on macOS with your example and another found svg

[Stefterv]

Thank you Junology for this pull request! Really cool to see such a quick fix!

[Stefterv]

Great addition! One optional change, for future readability

[Stefterv]

Understandable, could it be with a enum instead of an integer? I'm afraid we might lose this documentation at some stage

[SableRaf]

Note: I updated the #816 placeholder to include @SaumyaKarnwal's Diff and full description

[SableRaf]

I added a test case, but I am afraid it may not be enough.
In particular, the behavior of the function might change to some extent especially for 'ill-formed' SVG paths.
Please let me know if you have good test cases.

@Stefterv @Junology: Should we test this with a wider range of SVGs?

[Stefterv]

Yes, but it shouldn't block this PR

[Junology]

@Stefterv I made the type of lexState into an enum LexState. The if-branches got more self-documented now. Thank you for advice.

@SableRaf Variety of test cases would be very helpful when someone tries to extend the SVG parser (e.g. tag).

[SableRaf]

Merged! Thanks @Junology for you contribution and @Stefterv for your review 💙

Variety of test cases would be very helpful when someone tries to extend the SVG parser (e.g. tag).

Thanks for clarifying. Please feel free to open a separate issue on adding SVG test cases.

[SableRaf]

@all-contributors please add @Junology for code

[allcontributors]

@SableRaf

I've put up a pull request to add @Junology! 🎉

[hx2A]

Thank you, @Junology , for this PR! A welcome enhancement to Processing's SVG support.

[Junology]

I tested #750 (and #816) can be closed now.