chore: Re-simplify IndexVersionType and MessageLevel with c++20

This sets our compiler requirements to gcc 11 and clang 13. If we
forgo the use of `using enum` we can drop to gcc 10 and clang 10 but
that means using `MessageLevel::Enum::Unknown` for direct enum access

Signed-off-by: Rachel Powers <508861+Ryex@users.noreply.github.com>

launcher/Application.cpp

@@ -241,7 +241,7 @@ void appDebugOutput(QtMsgType type, const QMessageLogContext& context, const QSt
 
     QString out = qFormatLogMessage(type, context, msg);
     if (APPLICATION->logModel) {
-        APPLICATION->logModel->append(messageLevelFromQtMsgType(type), out);
+        APPLICATION->logModel->append(MessageLevel::fromQtMsgType(type), out);
     }
 
     out += QChar::LineFeed;