Debugger: Do configuration error checking early on.

Add a configuration checking method to the Debugger manager,
depending on toolchain, wire it to the engines.
Check that in the debugger run controls.

Add a convenience method to ICore that shows a warning
message with a "Settings" button, pointing the user
to a configuration error on a settings page.

Remove leftovers of the dumper parser.
Acked-by: con <qtc-committer@nokia.com>

src/plugins/debugger/debuggermanager.h

@@ -173,6 +173,11 @@ public:
 
     bool debuggerActionsEnabled() const;
 
+    bool checkDebugConfiguration(int toolChain,
+                                 QString *errorMessage,
+                                 QString *settingsCategory = 0,
+                                 QString *settingsPage = 0) const;
+
     static DebuggerManager *instance();
 
 public slots: