IDE-1229

- Fix the getProject problem when a liferay project is nested in another
  project.
- Revalidate portlet.xml and liferay-hook.xml when the language properties
  get changed.
- Add "Encode" action for the non-default encoding liferay language
  properties file.
IDE-1229 Finish quick fix and refreshing language properties markers

- Add JavaElementChangedListener to listen the change of language
  properties and validate its encoding.
- Add Quick fix for "encoding not default" marker.
IDE-1229
- Move the Liferay Language Properties Marker Resolution from com.liferay.ide.core to com.liferay.ide.ui.
- Remove the useless ValidationPreferences.
IDE-1229 Use IResourceChangeListener to replace IElemetChangedListener