ticket:10499: genrb use explicit UnicodeString constructors

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ticket:10499 fix compile error with gcc.

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk/source@34872 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10561: ZoneMeta methods must check for bogus input strings

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ticket:10043: ignore the genrb --omitCollationRules flag while importing rules

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ticket:8464: Add Suggested changes from Markus.

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ticket:10623: Integrated data generated from CLDR 25-M1, but skipped new data in data/coll/

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ticket:10591: Hoist setContext from SimpleDateFormat/RelativeDateFormat to DateFormat

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