Add Markdown parser to HTML Text Control

[ericonline]

Working with the HTML Text control is challenging due to the " " an Concat-required "&" or "," mixed with all the HTML tags <this> and <that>. Its just too many symbols to contend with (IMHO 😉 ).

Please consider simplifying things by using a Markdown-capable rendering engine so we can quickly do things like: 

# Report from user.Text

## Results

- Item 1: reportElement1.Text
- Item 2: reportElement2.Text
- Item 3: reportElement3.Text

### Wouldn't this be great?!

Thanks for all the hard work @powerapps Team!