- add new JavaElementUtil.isForbiddenOnClasspath() method to figure
  out if a qualified name is forbidden or discouraged on the class path
  of the project of a given type root
- modify UnresolvedElementBaseSubProcessor to use new API
- modify OrganizeImportsOperation to check if a static import from
  the favorites is forbidden in the class path of the compilation unit
- add new test to ImportOrganizeTest1d8
- fixes #2893