icu: updated to 60.1

Changes 60.1:
* Unicode 10.0: 8,518 new characters, including four new scripts, 7,494 new Han characters, and 56 new emoji characters.
  - Properties newly supported in ICU: Emoji_Component, Regional_Indicator, Prepended_Concatenation_Mark
* CLDR 32:
  - Data for several (mostly Asian) new languages, date formatting patterns using colloquial day period formats ("h:mm B" → “1:30 in the afternoon”), and many other data improvements.
  - See the CLDR download page for other CLDR features and migration issues in CLDR 32.
* NumberFormatter, a new number formatting API: A long-overdue refresh of number formatting in ICU with a focus on usability, robustness, and performance.  The 30+ settings in DecimalFormat are reduced to 8 in NumberFormatter; all NumberFormatter objects are thread-safe and immutable; and the code is efficient in both the client-side (constant locale) and server-side (variable locale) use cases.
  - New users are encouraged to use the new API for number formatting.  However, preexisting code can continue using the old API, which has been partially made into a wrapper over the new API.
  - Documentation: in Java, see com.ibm.icu.number.NumberFormatter, and in C++, see i18n/unicode/numberformatter.h.
* New options for titlecasing:
  - Sentence titlecasing and whole-string titlecasing without custom BreakIterator instances.
  - The default index adjustment has been changed from "find first cased character" to "find first letter, number, or symbol"; a new option is available for selecting the previous adjustment behavior.
* Smaller data files for BreakIterator.
  - Reverse rules no longer used: Easier updates, easier to conform to Unicode Standard.
  - Old source rule files continue to work, reverse rules are ignored.
  - Rule-based data files: 1.2MB→0.8MB.

ICU4C Specific Changes
* New API for direct-UTF-8 normalization.
  - It also optionally records changes, for source-to-result index mapping and tracking of text metadata.
* More convenient case mapping API (StringPiece→ByteSink).
* ICU now handles ill-formed UTF-8 byte sequences as specified in the W3C Encoding Standard.

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