Moved all *_CONTEXT_* router related classes into wsf_router_context.ecf library

This makes wsf simpler to discover.
And advanced context enabled handler, mapping, ... are still available for now in wsf_router_context.ecf library

library/server/wsf/wsf_extension.ecf

@@ -13,6 +13,7 @@
 		<library name="http" location="../../network/protocol/http/http.ecf"/>
 		<library name="ewsgi" location="..\ewsgi\ewsgi.ecf"/>
 		<library name="wsf" location="wsf.ecf"/>
+		<library name="wsf_router_context" location="wsf_router_context.ecf" readonly="true"/>
 		<cluster name="extension" location="./extension" recursive="true"/>
 	</target>
 </system>