IDE-932

Fix cannot open new portlet wizard bug;
Make sure to only show available superclasses
in the dropdown list after switching projects.
IDE-919

Add validation for namespace element and package-path
attribute in service builder descriptor and new service
builder wizard;
Fix some NullPointerExceptions for liferay descriptors
when switch severity level to ignore.
IDE-946

Add liferay-portlet.xml validation for latest
class element changes and sort them.
IDE-919

Remove useless code.
IDE-961

Fix the ResourceException caused by entry category
and the spelling mistake of category.
IDE-931

fix the ResourceException when create a liferay project and click on next
to create a portlet class,then to look for the display categories.