ticket:10046: Expose Exponent Multiplication Symbol. ScientificFormatHelper class to recognize variants of the plus and minus sign.

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk@35614 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10822: C wrapper implementation for udat_get.../udat_setBooleanAttribute  

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk@35615 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10822: remove static from test method

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk@35616 251d0590-4201-4cf1-90de-194747b24ca1