app: migrate all engine access to the C ABI facade (nm U _ZN5olive = 0)

Every app module now reaches liboakengine exclusively through
oakengine_* C calls, EngineEventBridge subscriptions and app-side
handle headers (cliphandle/keyframehandle/nodevaluehandle/oakvaluehelper).
Direct C++ command construction, engine signal connect()s, and engine
type usage in MOC-visible signatures are gone: 557 -> 0 undefined
olive:: symbols in oak-editor.

app/dialog/configbase/configdialogbase.cpp

@@ -27,6 +27,7 @@
 
 #include "core.h"
 
+#include "oakengine/undo.h"
 namespace olive
 {
 
@@ -70,13 +71,13 @@ void ConfigDialogBase::accept()
 		}
 	}
 
-	MultiUndoCommand *command = new MultiUndoCommand();
+	void *command = oakengine_undo_command_create_multi();
 
 	foreach (ConfigDialogBaseTab *tab, tabs_) {
 		tab->accept(command);
 	}
 
-	Core::instance()->undo_stack()->push(command, tr("Set Configuration"));
+	oakengine_undo_push(command, tr("Set Configuration").toUtf8().constData());
 
 	AcceptEvent();
 

app/dialog/configbase/configdialogbasetab.h

@@ -24,8 +24,7 @@
 
 #include <QWidget>
 
-#include "config/config.h"
-#include "undo/undocommand.h"
+#include "common/configwrapper.h"
 
 namespace olive
 {
@@ -36,7 +35,7 @@ public:
 
 	virtual bool validate();
 
-	virtual void accept(MultiUndoCommand *parent) = 0;
+	virtual void accept(void *parent) = 0;
 };
 
 }