debugger: start 'runcontrol-ification' of the debugger plugin.

This replaces most uses of DebuggerStartParameters by DebuggerRunControl
which is a simple RunControl with a DebuggerStartParameters member.

Plan is to move all global state to the run controls, and possibly
introduce specialized ones for core debugging etc.

src/plugins/debugger/debuggerplugin.h

@@ -57,11 +57,11 @@ namespace Debugger {
 
 class DebuggerManager;
 class DebuggerUISwitcher;
+class DebuggerRunControlFactory;
 
 namespace Internal {
 
 class BreakpointData;
-class DebuggerRunControlFactory;
 class DebugMode;
 
 class DebuggerPlugin : public ExtensionSystem::IPlugin