Revert "Delete .project"

This reverts commit c55600149da5662262313778231eb4f4d863855b.
Revert "Delete org.eclipse.ltk.core.refactoring.prefs"

This reverts commit 17f0f76b24f6f76fd22d3aaa01ffc603b8f4653d.
Revert "Delete .classpath"

This reverts commit d163eb101aee8d230b8c5259197e569bbab3bfbd.