icu: updated to 60.2

60.2:
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竊達yteSink).
ICU now handles ill-formed UTF-8 byte sequences as specified in the W3C Encoding Standard.

Bug fixes:
CLDR 32.0.1
- Change of some German AM/PM to English strings reverted; will be revisited.
- BGN transliterations restored.
The Script_Extensions property value for 5 CJK characters is wrong.
ICU4J DecimalFormat
- getGroupingSize() returns -1 instead of 0 in ICU60 if grouping is disabled
- setPositivePrefix also changes negative prefix
- unsets maxFrac when minFrac is set on a currency instance
DateFormat
- Urdu Islamic calendar eras
- Narrow format of noon time is used for abbreviated day period pattern letter 'b' and 'bb'
Conversion buffer overflow
Calendar buffer overrun
Windows C++: The header file "stringoptions.h" is not included in the the pre-built binary .zip file download.
Fix various typos and spelling mistakes.

(adam)