Move to built-in gutter renderer to prevent exception

[CodeDrivenMitch]

The way the gutter icon was built/customized to provides a popover even if only one item was in there, turned out to cause a lot of trouble. This PR simplifies it back to the way JetBrains recommends it. Fixes #235.

[github-actions]

Qodana Community for JVM

31 new problems were found

Inspection name	Severity	Problems
Unresolved reference in KDoc	🔶 Warning	25
'Enum.values()' is recommended to be replaced by 'Enum.entries' since 1.9	🔶 Warning	6

💡 Qodana analysis was run in the pull request mode: only the changed files were checked

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[smcvb]

Looks good to me 👍