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

to help enable better querying of supported features

src/osgPlugins/curl/ReaderWriterCURL.cpp

@@ -144,6 +144,7 @@ ReaderWriterCURL::ReaderWriterCURL()
 {
     supportsProtocol("http","Read from http port using libcurl.");
     supportsExtension("curl","Psuedo file extension, used to select curl plugin.");
+    supportsExtension("*","Passes all read files to other plugins to handle actual model loading.");
     supportsOption("OSG_CURL_PROXY","Specify the http proxy.");
     supportsOption("OSG_CURL_PROXYPORT","Specify the http proxy oirt.");
 }