Debugger: Use kit macro expander instead of global one where possible

This is low hanging fruit enabling a lot more customization.

Change-Id: I1a90fa731ea512852c12a55fad75551efb44e875
Reviewed-by: Christian Stenger <christian.stenger@theqtcompany.com>

src/plugins/debugger/debuggerengine.h

@@ -44,6 +44,7 @@ class QAbstractItemModel;
 QT_END_NAMESPACE
 
 namespace Core { class IOptionsPage; }
+namespace Utils { class MacroExpander; }
 
 namespace Debugger {
 
@@ -112,6 +113,8 @@ public:
 
     bool nativeMixedEnabled = false;
 
+    Utils::MacroExpander *macroExpander = 0;
+
     // For Debugger testing.
     int testCase = 0;
 };
@@ -319,6 +322,9 @@ public:
     void updateBreakpointMarker(const Breakpoint &bp);
     void removeBreakpointMarker(const Breakpoint &bp);
 
+    QString expand(const QString &string) const;
+    QByteArray expand(const QByteArray &string) const;
+
 signals:
     void stateChanged(Debugger::DebuggerState state);
     // A new stack frame is on display including locals.