[FR] Icons for issue type, severity, and priority

[sean256]

Please describe the problem / need you are trying to solve.
Issues (and some other things) use little solid color circles to indicate what they are. This is very hard to track and even harder for color blind users.

Describe the feature or the improvement you'd like and what are you trying to achieve.
Just replace the color circles with icons. Maybe the icons can have colors too.