QtC Outline View missing/confusing icons when using QmlLS

As part of the https://bugreports.qt.io/browse/QTBUG-120002 I have implemented Document Symbols request support for the QmlLS.

Unfortunately, QtC is either lacking support for some of the "SymbolKind"-s (from the lsp specs) and/or associate different icons with them.

For example SymbolKind::Event and SymbolKind::Method have the same icon. SymbolKind::Class results in some form of "namespace", which is prolly ok, but the "in-built" version represents it as some form of "square...".

I'm also attaching the VSCode view as for the reference / inspo

Steps to reproduce:

1. clone dev branch of qtdeclarative  && build qmlls target
2. Add LanguageServer in the QtC with the binary pointing to the freshly built qmlls
3. Open a qml file attached

Feel free to reach out to me for more info if needed