allow reading an SVG file with multiple paths

[efc]

This pull request provides SwiftSVG with the ability to read in an SVG file and provide named access to the individual paths in the file. The names used to access the paths will correspond to the id attributes path elements in the SVG file.

For example, given an SVG file named "shapes.svg" like this:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0" y="0" width="100" height="100" viewBox="0, 0, 100, 100">
  <g id="Background">
    <rect x="0" y="0" width="100" height="100" fill="#FFFFFF"/>
  </g>
  <g id="shapes">
    <path d="M10,10 L90,10 L90,90 L10,90 L10,10 z" fill="#B10000" id="square"/>
    <path d="M50,90 C27.909,90 10,72.091 10,50 C10,27.909 27.909,10 50,10 C72.091,10 90,27.909 90,50 C90,72.091 72.091,90 50,90 z" fill="#B1B100" id="circle"/>
  </g>
</svg>

We could use this feature to read in the file like this:

let pathsByName = Bundle.main.url(forResource: "shapes", withExtension: "svg")?.pathsByName()

Then draw the square with:

let parsedPath = pathsByName?["square"];
parsedPath?.stroke()

Or draw the circle with:

let parsedPath = pathsByName?["circle"];
parsedPath?.stroke()

[Superolo]

I would like to use this feature. Why is not pulled yet?

[taboulot]

Any news on this feature ?