Output MD-styled cell text in table to_markdown() method

[JorjMcKie]

Is your feature request related to a problem? Please describe.
The string produced by Table.to_markdown() should contain cell text styled as Markdown and specifically support strikeout, bold and italic.

Describe the solution you'd like
Line breaks already are written as HTML tags <br> instead of \n. This should be extended to MD syntax ~~, ** _ and <code> for strikeout, bold, italic and monospace.

Describe alternatives you've considered
N/A

Additional context
N/A