It was initially implemented as a potential code style analyzer, but we have agreed on it being a code quality analyzer, with no special IDE options/preferences logic.
I have switched the analyzer to be implemented just like a regular third party analyzer.
This cleans up the implementation quite a bit, and also fixes the issue where we reported hidden diagnostics for this analyzer instead of suggestion diagnostics as the default code style diagnostic severity is hidden.
I have also reverted AbstractCodeStyleDiagnosticAnalyzer.cs to the state before this analyzer was implemented.