CppEditor: Fix "move function definition"

... for member functions with exception specification and/or reference
qualifiers.
The FunctionDeclaratorAST::cv_qualifier_list member can contain both the
proper qualifiers "const" and "volatile" as well as the pseudo-qualifiers
"override" and "final". The problem is that the former appear before
exception specification and reference qualifiers, whereas the latter come
afterwards. Therefore, when calculating the declarator's first and last
tokens, we can't just mechanically check the different declarator members
in order. Instead, we need to compare the token values to see which
comes first.

Task-number: QTCREATORBUG-27132
Change-Id: I924f9afe49453fa51b4a2fe010d1cc00c9defad1
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/cppeditor/cppquickfix_test.h

@@ -192,6 +192,7 @@ private slots:
     void testMoveFuncDefOutsideUnnamedTemplate();
     void testMoveFuncDefOutsideMemberFuncToCppStatic();
     void testMoveFuncDefOutsideMemberFuncToCppWithInlinePartOfName();
+    void testMoveFuncDefOutsideMixedQualifiers();
 
     void testMoveAllFuncDefOutsideMemberFuncToCpp();
     void testMoveAllFuncDefOutsideMemberFuncOutside();