Converted plugins to use the new supportsExtension()/supportsOptions/supportsProtocl() methods

to help enable better querying of supported features

src/osgPlugins/Inventor/ReaderWriterIV.cpp

@@ -27,6 +27,8 @@ REGISTER_OSGPLUGIN(Inventor, ReaderWriterIV)
 
 ReaderWriterIV::ReaderWriterIV()
 {
+    supportsExtension("iv","Inventor format");
+    supportsExtension("wrl","VRML world file");
 }
 
 // Read file and convert to OSG

src/osgPlugins/Inventor/ReaderWriterIV.h

@@ -19,12 +19,6 @@ class ReaderWriterIV : public osgDB::ReaderWriter
             return osgDB::equalCaseInsensitive(extension, "iv") ? true : false;
         }
 
-        virtual bool acceptsExtension(const std::string& extension) const
-        {
-            return isInventorExtension(extension) ? true :
-                   osgDB::equalCaseInsensitive(extension, "wrl") ? true : false;
-        }
-        
         virtual ReadResult readNode(const std::string& filename, 
                                     const osgDB::ReaderWriter::Options *) const;