Update plugin to be compatible with 243

[czoido]

Also remove some dead code and update several parts of the plugin, including migrate to IntelliJ Platform Gradle Plugin (2.x)

[github-actions]

Qodana Community for JVM

2 new problems were found

Inspection name	Severity	Problems
Unused import directive	🔶 Warning	2

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

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