Debugger: Fix team restart request.

UserInterface:
- Add Clone() function to set of required virtuals. This asks the subclass
  to create a new instance of its respective type.

{CommandLine,Graphical,Report}UserInterface:
- Implement the above function.

TeamDebugger:
- Add accessor for the currently active UI.

TargetHostInterface:
- Set correct request type when setting up the options for a team restart.
- Ask the TeamDebugger for its user interface and clone it in order to fill
  in that aspect of the debug options. This fixes a regression introduced in
  commit 880a64, which inadvertently resulted in team restarts no longer
  working.

headers/private/debugger/controllers/TeamDebugger.h

@@ -66,6 +66,8 @@ public:
 									{ return fCommandLineArgv; }
 			SettingsManager*	GetSettingsManager() const
 									{ return fSettingsManager; }
+			UserInterface*		GetUserInterface() const
+									{ return fUserInterface; }
 
 	virtual	void				MessageReceived(BMessage* message);