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/RhinoScriptTest.java

@@ -260,7 +260,7 @@ public class RhinoScriptTest extends TestCase
                         scriptService.executeScript(contentNodeRef, BaseNodeServiceTest.PROP_QNAME_TEST_CONTENT, model);
                         
                         // test executing a script directly as a String
-                        scriptService.executeScriptString(TESTSCRIPT1, model);
+                        scriptService.executeScriptString("javascript", TESTSCRIPT1, model);
                     }
                     catch (Throwable err)
                     {