ticket:9101: builder lookup of CEs from NFD text, some cleanup

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/markus@33617 251d0590-4201-4cf1-90de-194747b24ca1
ticket:9101: builder: simple reset, set CEs for =, some more wiring

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/markus@33629 251d0590-4201-4cf1-90de-194747b24ca1