Even better overlay styling

[yyx990803]

• Using ansi-html instead of ansi-to-html-umd, which gives us the ability to customize the color output instead of hard-coded colors; (also avoid having to do the umd wrap)
• Adjusted color scheme, fonts, spacing, and added problem type labels. Also added slight opacity to background so that it's more obvious to the user that the current app state is being preserved.
• Moved the ANSI -> HTML conversion logic into client-overlay.js instead of client.js. This way custom overlay implementations receive raw ANSI strings instead of pre-converted HTML so that they have more flexibility in how to display the messages.

Before

After

[yyx990803]

Ah, just found out ansi-html doesn't handle HTML entity escape. Looking into that.

[glenjamin]

Great work, that looks ace!

[rossipedia]

Neat! Much better than my original impl, looks good 👍

[glenjamin]

Released as 2.9.0