Debugger: Export DebuggerManager and DebuggerStartParameters.

For device debugging. Move both from namespace
Debugger::Internal to Debugger, export them, give
DebuggerManager a static instance().

src/plugins/debugger/stackwindow.h

@@ -39,9 +39,9 @@ class QModelIndex;
 QT_END_NAMESPACE
 
 namespace Debugger {
-namespace Internal {
-
 class DebuggerManager;
+
+namespace Internal {
 class DisassemblerViewAgent;
     
 class StackWindow : public QTreeView