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

to help enable better querying of supported features

src/osgPlugins/pic/ReaderWriterPIC.cpp

@@ -191,8 +191,12 @@ int *numComponents_ret)
 class ReaderWriterPIC : public osgDB::ReaderWriter
 {
     public:
+        ReaderWriterPIC()
+        {
+            supportsExtension("pic","PIC Image format");
+        }
+        
         virtual const char* className() const { return "PIC Image Reader"; }
-        virtual bool acceptsExtension(const std::string& extension) const { return osgDB::equalCaseInsensitive(extension,"pic"); }
 
         virtual ReadResult readObject(const std::string& file, const osgDB::ReaderWriter::Options* options =NULL) const
         {