Parse block content of TSDoc tags as markdown/html/more complex structure

[jesperorb]

One of the main advantages TSDoc tags have over regular JSDoc tags is that the parser can parse and handle markdown in block tag content, it expects the content to be markdown.

The current parsing in the reporter does not take advantage of this and only outputs raw text.

What needs to be done:

• Create model for tag content that allows more complex output
• Parse tag content for TSDoc tags based on this model