[LiveLogger] Don't render any yellow or red unless/until there is a warning/error

[ladipro]

The cross mark ❌ character is usually rendered in red and it unnecessarily creates the impression that something is wrong even if the build is progressing just fine. Similar for the yellow exclamation point.

Suggestion: Add the <number> ℹ️, <number> ⚠️, <number> ❌ output only when <number> is >0 (for each of the three).

[rainersigwald]

Strong agree on the principle "don't draw red unless there's a problem".

I'm less sure I like this display model overall--if we achieve the "warnings and errors are basically always on screen after they occur" model, we may not care about counts in the live display at all.

[edvilme]

This could be removed entirely (and maybe replaced with "Finished without errors or warnings", or something lime that?)