Refactors AnisRenderer

[David-Rushton]

Issues

1. AnsiRenderer is hard to read, as it spans too many lines
2. It does not support embedded inlines
3. It does not support the full CommonMark spec, including:

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AC

• AnsiRenderer should be broken in separate classes and/or files
• AnsiRenderer should support full CommonMark spec
• AnsiRenderer should be best effort
  • Never throw
  • Fallback to plain text when uncertain
• AnsiRenderer should collect warnings and errors as it progresses
• MarkdownConsole should expose/return warnings and errors

EDIT See revised A/C below.

CommonMark spec

As far as I know our markdown parser supports the full spec. So we should be able to meet this goal. However if I am wrong we should still make a best effort. Any types not supported should be rendered as plain text.

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[David-Rushton]

Plan:

• Keep all changes already in the PR
• Limit remaining scope to refactor
• Raise additional requests as comment above

[David-Rushton]

This PR fails to build. Because AnsiRenderer tries to detect the console width. At the point it does this there is no console attached.

[David-Rushton]

Revised AC

• AnsiRenderer should be broken in separate classes and/or files
• ~AnsiRenderer should support full CommonMark spec~
• AnsiRenderer should be best effort
  • Never throw
  • Fallback to plain text when uncertain
• ~AnsiRenderer should collect warnings and errors as it progresses~
• ~MarkdownConsole should expose/return warnings and errors~

Descoped items will return in a future PR.