Added a bunch of files synched with 0.8.42

src/osgDB/ReadFile.cpp

@@ -0,0 +1,27 @@
+#include "osg/Notify"
+#include "osg/Object"
+#include "osg/Image"
+#include "osg/Node"
+
+#include "osgDB/Registry"
+#include "osgDB/ReadFile"
+
+using namespace osg;
+using namespace osgDB;
+
+Object* osgDB::readObjectFile(const std::string& filename)
+{
+    return Registry::instance()->readObject(filename);
+}
+
+
+Image*  osgDB::readImageFile(const std::string& filename)
+{
+    return Registry::instance()->readImage(filename);
+}
+
+
+Node*   osgDB::readNodeFile(const std::string& filename)
+{
+    return Registry::instance()->readNode(filename);
+}