ticket:11061: Import full bcp47 keys/types from CLDR. This change is corresponding to cldrbug:7249

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk@36151 251d0590-4201-4cf1-90de-194747b24ca1
ticket:11058: support nested collation rule imports; make the importer stateless

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk@36157 251d0590-4201-4cf1-90de-194747b24ca1