LPS-44429 Implementing the update method, also wrapping the export method
LPS-44429 Implementing update in the action class

Conflicts:
	portal-impl/src/com/liferay/portlet/layoutsadmin/action/EditExportConfigurationAction.java
LPS-44429 Add UI portion to edit existing configurations
LPS-44429 Source format and simplify
LPS-44429 Persist the state through page refreshes
LPS-44429 More source format and simplify
LPS-44429 Autogenerated