Add support for HTML format

[marciniwanicki]

Describe your changes
Added a basic HTML renderer so the report can be quickly open in a browser.
Needed to refactor Renderer and TextProjectCompareResultRenderer to have more flexibility while rendering elements.

Testing performed
Added only 2 manual test commands for now so we do not need to pay extra cost for all the permutations.

[codecov]

Codecov Report

Merging #56 into master will increase coverage by 0.24%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #56      +/-   ##
==========================================
+ Coverage   95.77%   96.02%   +0.24%     
==========================================
  Files          43       43              
  Lines        1467     1558      +91     
==========================================
+ Hits         1405     1496      +91     
  Misses         62       62              

Impacted Files	Coverage Δ
Sources/XCDiffCore/ProjectComparator.swift	100.00% <ø> (ø)
...ultRenderer/TextProjectCompareResultRenderer.swift	100.00% <100.00%> (ø)
...Core/ResultRenderer/Renderer/ConsoleRenderer.swift	100.00% <100.00%> (ø)
...iffCore/ResultRenderer/Renderer/HTMLRenderer.swift	100.00% <100.00%> (ø)
...ore/ResultRenderer/Renderer/MarkdownRenderer.swift	100.00% <100.00%> (ø)
...fCore/ResultRenderer/UniversalResultRenderer.swift	100.00% <100.00%> (ø)

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[kwridan]

Nice work! The reports look great 👍

Some ideas for future enhancements:

• Listing the paths to the projects in the report? (I guess this isn't exclusive to the html report)

• Possibly making the sections expandable / collapsable to ease navigation

[marciniwanicki]

I like the suggested enhancements :), added tickets: #58, #57