There are significant changes in the spoof checking reflecting
http://www.unicode.org/reports/tr39/tr39-15.html and relying on the
restriction levels. ICU 58+ removes WSC and MSC handling and otherwise
undergoes big changes in both code and data areas. Keep up with the
basic points for now, as we need to move forward and provide an
acceptable experience to PHP users linking to a newer ICU. The most
distros ATM don't provide ICU > 57.1, though. We'll need for sure to
keep up with the BC breach in ICU 58+ in possible further aspects.
Introduces a ZEND_PARSE_PARAMS_THROW flag for zpp, which forces to
report FAILURE errors using a TypeException instead of a Warning,
like it would happen in strict mode.
Adds a zend_parse_parameters_throw() convenience function, which
invokes zpp with this flag.
Converts all cases I could identify, where we currently have
throwing zpp usage in constructors and replaces them with this API.
Error handling is still replaced to EH_THROW in some cases to handle
other, domain-specific errors in constructors.
