Added "on_handler_mapped" callback

to allow any REQUEST_HANDLER to record the existing routes.

library/server/request/router/router.ecf

@@ -24,7 +24,7 @@
 			<exclude>/EIFGENs$</exclude>
 			<exclude>/.svn$</exclude>
 		</file_rule>
-		<option warning="true" full_class_checking="true">
+		<option warning="true" full_class_checking="true" syntax="provisional">
 			<assertions precondition="true"/>
 		</option>
 		<library name="base" location="$ISE_LIBRARY\library\base\base.ecf"/>