'gtk2_ardour (msvc)' - Some changes needed before anything at all will compile

For the most part, the compilation problems are caused by lines such as:-

      WM::Proxy<ThemeManager> theme_manager;

Before MSVC will compile the above it needs to know that the specified object type contains an appropriate (i.e. publicly available) default c'tor. Therefore the corresponding header file needs to get #included, rather than just declaring that type to be a class (whilst all classes have a default c'tor, it needn't necessarily be public). The remaining changes are mostly minor.

This commit should be tested ASAP to make sure it doesn't upset the other compilers.

gtk2_ardour/ardour_ui.h

@@ -66,6 +66,7 @@
 
 #include "video_timeline.h"
 
+#include "about.h"
 #include "ardour_button.h"
 #include "ardour_dialog.h"
 #include "ardour_window.h"
@@ -77,35 +78,35 @@
 #include "visibility_group.h"
 #include "window_manager.h"
 
-class About;
-class AddRouteDialog;
-class AddVideoDialog;
+#include "add_route_dialog.h"
+#include "add_video_dialog.h"
+#include "big_clock_window.h"
+#include "bundle_manager.h"
+#include "global_port_matrix.h"
+#include "keyeditor.h"
+#include "location_ui.h"
+#include "rc_option_editor.h"
+#include "route_params_ui.h"
+#include "session_option_editor.h"
+#include "speaker_dialog.h"
+#include "theme_manager.h"
+
 class VideoTimeLine;
 class SystemExec;
 class ArdourStartup;
 class ArdourKeyboard;
 class AudioClock;
-class BigClockWindow;
-class BundleManager;
 class ButtonJoiner;
 class ConnectionEditor;
 class EngineControl;
-class KeyEditor;
-class LocationUIWindow;
 class MainClock;
 class Mixer_UI;
 class PublicEditor;
-class RCOptionEditor;
-class RouteParams_UI;
-class SessionOptionEditor;
 class ShuttleControl;
 class Splash;
-class SpeakerDialog;
-class ThemeManager;
 class TimeInfoBox;
 class MidiTracer;
 class LevelMeterHBox;
-class GlobalPortMatrixWindow;
 class GUIObjectState;
 
 namespace Gtkmm2ext {

gtk2_ardour/option_editor.h

@@ -30,6 +30,9 @@
 #include "audio_clock.h"
 #include "ardour/types.h"
 
+using namespace Glib;
+using namespace Gtk;
+
 /** @file option_editor.h
  *  @brief Base class for option editing dialog boxes.
  *

gtk2_ardour/rc_option_editor.h

@@ -17,6 +17,9 @@
 
 */
 
+#ifndef __gtk_ardour_rc_option_editor_h__
+#define __gtk_ardour_rc_option_editor_h__
+
 #include "option_editor.h"
 #include "visibility_group.h"
 
@@ -54,3 +57,5 @@ private:
 
         PBD::ScopedConnection parameter_change_connection;
 };
+
+#endif /* __gtk_ardour_rc_option_editor_h__ */