ticket:8464: Use UNICODE_STRING_SIMPLE instead of UnicodeString constructor

git-svn-id: http://source.icu-project.org/repos/icu/icu@34707 251d0590-4201-4cf1-90de-194747b24ca1
ticket:8464: UDAT_DIRECION_UNIT_COUNT -> UDAT_DIRECTION_COUNT

git-svn-id: http://source.icu-project.org/repos/icu/icu@34708 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10505: Do not use u_austrncpy where not necessary

git-svn-id: http://source.icu-project.org/repos/icu/icu@34710 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10567: merge r34586 for #10486, r34703 for #10500, r34710 for #10505


git-svn-id: http://source.icu-project.org/repos/icu/icu@34711 251d0590-4201-4cf1-90de-194747b24ca1
ticket:8464: Change C++ code according to latest API proposal.

git-svn-id: http://source.icu-project.org/repos/icu/icu@34712 251d0590-4201-4cf1-90de-194747b24ca1