IDE-1607 Added ServiceMethodImplementationHyperlinkDetector
IDE-1571 Added portlet url hyperlink detector
IDE-1607 added support for finding methods in supertypes
IDE-1565 added liferay-ui:message key lookup support
IDE-1591 delete sample files when creating project without sample code
  - view.jsp
  - main.css
  - main.js
IDE-1566 added message/error key hover for portlet projects
IDE-1566 Add hover support for aui:* tags with label="..." attr
IDE-1557 refactored codes about descriptor helpers

- move classes of descriptors to com.liferay.ide.project.core.descriptor
- make class LiferayDescriptorHelper abstract
- new way to invoke descriptors' operations
- rename LiferayProjectCore class to ProjectCore