Refactor of template and script services to allow easy addition of further template and script processors.

Hightlights of check-in include:
- Introduction of script processor 
- Neutralisation of script and template models
- The notion of a processor extension introduced
- Extensions applied to processor implementation rather than the services
- Auto selection of processor based on file extension of template or script

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@5519 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/repo/jscript/Session.java

@@ -24,6 +24,7 @@
  */
 package org.alfresco.repo.jscript;
 
+import org.alfresco.repo.processor.BaseProcessorExtension;
 import org.alfresco.service.ServiceRegistry;
 
 /**
@@ -33,7 +34,7 @@ import org.alfresco.service.ServiceRegistry;
  * 
  * @author Andy Hind
  */
-public class Session extends BaseScriptImplementation
+public class Session extends BaseProcessorExtension
 {
     /** Service registry */
     private ServiceRegistry services;