Improve configurability of DownStyler

[mgacy]

Extends configurability of DownStyler and extends #184

• adds public, memberwise initializers for styling options
• adds public, memberwise initializers for DownStylerConfiguration
• makes ParagraphStyleCollection a protocol and adds StaticParagraphStyleCollection to match other attribute collections
• makes properties and methods of ListItemParagraphStyler public

[iwasrobbed-ks]

👋 Hi there @mgacy

Thanks for the changes 👍 This is definitely a deficiency in Swift at the moment. Swift 5.1 autogenerates inits with defaults but then if you want a public init then you have to implement it yourself :\ (see Default Memberwise Initializers for Structure Types)

👉 Please fix the broken tests before this can get merged.

[codecov]

Codecov Report

Merging #188 into master will decrease coverage by 3.38%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #188      +/-   ##
==========================================
- Coverage   35.98%   32.59%   -3.39%     
==========================================
  Files          54       74      +20     
  Lines        1070     2362    +1292     
==========================================
+ Hits          385      770     +385     
- Misses        685     1592     +907

Impacted Files	Coverage Δ
...tribute Collections/ParagraphStyleCollection.swift	0% <ø> (ø)	⬆️
Source/AST/Styling/Options/ListItemOptions.swift	0% <0%> (ø)
...ource/AST/Styling/Options/QuoteStripeOptions.swift	0% <0%> (ø)
.../AST/Styling/Helpers/ListItemParagraphStyler.swift	0% <0%> (ø)	⬆️
.../AST/Styling/Stylers/DownStylerConfiguration.swift	0% <0%> (ø)	⬆️
Tests/Styler/StylerTestSuite.swift	0% <0%> (ø)
Source/AST/Styling/Options/CodeBlockOptions.swift	0% <0%> (ø)
...rce/AST/Styling/Options/ThematicBreakOptions.swift	0% <0%> (ø)
Tests/Styler/LinkStyleTests.swift	0% <0%> (ø)
Tests/Styler/HeadingStyleTests.swift	0% <0%> (ø)
... and 18 more

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[iwasrobbed]

@johnxnguyen Any objections here?

[johnxnguyen]

Looks good, thanks for this @mgacy .