[xbase][validation] JvmTypeReferencesValidator is language agnostic

see https://bugs.eclipse.org/bugs/show_bug.cgi?id=453286

Change-Id: I8ad3a52553bc8cb6d2e848c4217d0c2d0cdb9926
refine naming of ide base package
regenerated xbase and test/example languages after CA fragment changes
Merge "refine naming of ide base package"
Merge "regenerated xbase and test/example languages after CA fragment changes"