Enabled the use of Debugger-specific watch/locals models.

- Modified WatchModel to handle storage of an hierarchy
  of WatchItems.
- Factored out code for asynchronous population to
  AsyncWatchModel and added a mixin for convenient
  handling
- Added base class for synchronous models.
- Implement simple, synchronous models for CDB, greatly
  simplifying code and finally getting manual
  expansion right.
Signed-off-by: hjk <qtc-committer@nokia.com>

src/plugins/debugger/idebuggerengine.h

@@ -46,6 +46,8 @@ class ITextEditor;
 namespace Debugger {
 namespace Internal {
 
+class WatchModel;
+
 class Symbol;
 class WatchData;
 struct DebuggerStartParameters;
@@ -60,14 +62,13 @@ public:
     virtual bool startDebugger(const QSharedPointer<DebuggerStartParameters> &startParameters) = 0;
     virtual void exitDebugger() = 0;
     virtual void detachDebugger() {}
-    virtual void updateWatchData(const WatchData &data) = 0;
 
     virtual void stepExec() = 0;
     virtual void stepOutExec() = 0;
     virtual void nextExec() = 0;
     virtual void stepIExec() = 0;
     virtual void nextIExec() = 0;
-    
+
     virtual void continueInferior() = 0;
     virtual void interruptInferior() = 0;
 
@@ -95,6 +96,8 @@ public:
     virtual void reloadFullStack() = 0;
 
     virtual void watchPoint(const QPoint &) {}
+
+    virtual WatchModel *watchModel(int type) const = 0;
 };
 
 } // namespace Internal