StringCodec: use UTF-16BE as default encoding for ISO_10646 [STB-26877]
StringCodec: use UTF-16BE as default encoding for ISO_10646 [STB-26877]

Requested by QA.

I couldn't find in ISO/IEC 10646 what encoding must be used as default
when there is no BOM.....

See discussion in STB-26877:

ISO/IEC 10646 uses Basic Multilingual Plane(BMP)
BMP contains 65536 entries - i.e. can represented as 16bit value
then paragraph 5.1.6 of ETSI EN 300 468 says that big endian is default

So we select UTF-16BE as default.

GSGroup/stingraykit,GSGroup/stingraykit