ticket:10461: Check in code to add NumberFormat::createSharedNumberFormat. Tests fail.

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/tkeep@35086 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10461: Merge r3507 to r35087 from trunk.

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/tkeep@35088 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10461:shared_numfmt.h -> sharednumberformat.h

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/tkeep@35090 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10461:MeasureFormat to use NumberFormat::createSharedInstance.

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/tkeep@35091 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10461: Add caching to PluralRules.

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/tkeep@35096 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10461: MeasureFormat to use shared plural rules instance.

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/tkeep@35097 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10461:Clean up MeasureFormatCacheData class to handle constness correctly.

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/tkeep@35098 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10461: Keep ListFormatter in MeasureFormat object.

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/tkeep@35099 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10461: Define out of line virtual destructors for SharedNumberFormat and SharedPluralRules.

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/tkeep@35100 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10461: Move listFormatter out of shared object.

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/tkeep@35102 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10461: Create branch off of 10461.

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/tkeep@35103 251d0590-4201-4cf1-90de-194747b24ca1