Make inverting Y axis optional (with non-breaking default)

[leehericks]

As discussed in #3, this pull request allows setting parse options such that the y-axis will not be flipped, and it defaults to flipping, so this is not a breaking change.

I implemented this in the exact same format as the author's WriteOptions struct to be consistent.

I've used this with success to render kanji characters in SVG format.

let svgPath = try! SVGPath(string: pathData, with: .init(invertYAxis: false))
let cgPath = try! CGPath.from(svgPath: svgPath, with: .init(invertYAxis: false))

[nicklockwood]

Amazing! Thanks so much ❤️

[codecov]

Codecov Report

❌ Patch coverage is 77.77778% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 51.95%. Comparing base (381fd60) to head (2de40d0).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
Sources/SVGPath.swift	76.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #9      +/-   ##
==========================================
+ Coverage   51.46%   51.95%   +0.49%     
==========================================
  Files           2        2              
  Lines         581      587       +6     
==========================================
+ Hits          299      305       +6     
  Misses        282      282              

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[leehericks]

@nicklockwood Did you accidentally remove the change to SVGPath+CoreGraphics.swift when or after you merged this?

[nicklockwood]

I deliberately removed it - I don't think it's necesary to have that option when creating a CGPath from a String since you can use the convenience API available directly on SwiftUI.Path, or use the CGPath.from(SVGPath) version if you need an inverted CGPath for some reason