Debugger: Add size to watch data.

Have CDB report it, pass it on to adding watches.

src/plugins/debugger/watchdata.h

@@ -128,6 +128,7 @@ public:
     QByteArray type;         // Type for further processing
     QString    displayedType;// Displayed type (optional)
     quint64    address;      // Displayed address
+    uint       size;         // Size
     uint       bitpos;       // Position within bit fields
     uint       bitsize;      // Size in case of bit fields
     qint32     generation;   // When updated?