Render as Markdown analyzer and code fix

[sharwell]

Remaining tasks:

• Executing this action twice will wrap <para> blocks inside a new <para> block. A post-conversion transformation needs to undo this nesting.

• Executing this action will always wrap <summary> content in a <para> block. A post-conversion transformation needs to undo this if the <para> block is the only child of the <summary> block.

• Parameter names in backticks are treated as <c>paramName</c> instead of <paramref name="paramName"/>.

• Lines containing a top-level element from the original code get an extra space during the conversion operation. For example:

  Input:

  /// <summary>
  /// Text
  /// </summary>
  /// <remarks>
  /// Remark
  /// </remarks>

  Output (note the space before <remarks>):

  /// <summary>
  /// <para>Text</para>
  /// </summary>
  ///  <remarks>
  /// <para>Remark</para>
  /// </remarks>

[whoisj]

@sharwell the <para/> works wonder to place between paragraphs as well, with no need to bother "wrapping" anything. Just thought I'd point that out.

Also, using that was makes for significantly more readable documentation comments.