--legacy option

[swhitty]

The SFSymbol alignment logic was updated within #88 to be more precise and similar to the alignment of official SFSymbols:

This change may be unexpected for some users so this PR adds the --legacy option to preserve the alignment from previous version

--legacy             use the original, less precise alignment logic from earlier swiftdraw versions.

[codecov]

Codecov Report

❌ Patch coverage is 73.49398% with 22 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.60%. Comparing base (dd11d1d) to head (73cb83c).

Files with missing lines	Patch %	Lines
...Draw/Sources/CommandLine/CommandLine+Process.swift	0.00%	13 Missing ⚠️
SwiftDraw/Sources/Renderer/Renderer.SFSymbol.swift	75.00%	8 Missing ⚠️
...aw/Sources/CommandLine/CommandLine.Arguments.swift	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #89      +/-   ##
==========================================
- Coverage   89.66%   89.60%   -0.06%     
==========================================
  Files         144      144              
  Lines       12148    12181      +33     
==========================================
+ Hits        10892    10915      +23     
- Misses       1256     1266      +10     

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