Transform SVG instances

[swhitty]

Adds some helper methods to apply common transformations to instances of SVG:

• size: sets the current size of the SVG scaling it as required
• scale: increases the ideal rendered size of the image
• translate: shift the rendered image without adjusting the size.
• expand: add (or remove) padding around the image increasing the overall size.

let svg = SVG(name: "fish.svg")!  // 100x100 
    .expand(left: 10, right: 10)  // 120x100
    .scale(2)                     // 240x200

let image = svg.rasterize()       // 240x200

[codecov]

Codecov Report

Attention: Patch coverage is 61.86441% with 45 lines in your changes missing coverage. Please review.

Project coverage is 83.99%. Comparing base (172c636) to head (dbeb76f).
Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
SwiftDraw/CommandLine+Process.swift	0.00%	19 Missing ⚠️
SwiftDraw/SVG+Deprecated.swift	0.00%	15 Missing ⚠️
SwiftDraw/SVG.swift	89.47%	6 Missing ⚠️
SwiftDraw/SVG+CoreGraphics.swift	72.22%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #71      +/-   ##
==========================================
- Coverage   84.58%   83.99%   -0.59%     
==========================================
  Files          81       82       +1     
  Lines        7251     7322      +71     
==========================================
+ Hits         6133     6150      +17     
- Misses       1118     1172      +54     

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