Refactoring ext/intl (only compilerable now, far to finish :<)

Refactoring ext/intl (incompleted)

Cleanup (1-st round)

Use better data structures (incomplete)

intl: fix extra space in constant name

intl: add intlcal_set_minimal_days_in_first_week()

and IntlCalendar::setMinimalDaysInFirstWeek(). This one had slipped.
we had a ::getMinimalDaysInFirstWeek() but no way to change the va

intl: add intlcal_set_minimal_days_in_first_week()

and IntlCalendar::setMinimalDaysInFirstWeek(). This one had slipped.
we had a ::getMinimalDaysInFirstWeek() but no way to change the value.

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DateFormat plays nice with Calendar, TimeZone

The following changes were made:

* The IntlDateFormatter constructor now accepts the usual values
for its $timezone argument. Thi

DateFormat plays nice with Calendar, TimeZone

The following changes were made:

* The IntlDateFormatter constructor now accepts the usual values
for its $timezone argument. This includes timezone identifiers,
IntlTimeZone objects, DateTimeZone objects and NULL. An empty
string is not accepted. An invalid time zone is no longer accepted
(it used to use UTC in this case).
* When NULL is passed to IntlDateFormatter, the time zone specified in
date.timezone is used instead of the ICU default.
* The IntlDateFormatter $calendar argument now accepts also an
IntlCalendar. In this case, IntlDateFormatter::getCalendar() will
return false.
* The time zone passed to the IntlDateFormatter is ignored if it is
NULL and if the calendar passed is an IntlCalendar object -- in this
case, the IntlCalendar time zone will be used instead. Otherwise,
the time zone specified in the $timezone argument is used instead.
* Added IntlDateFormatter::getCalendarObject(), which always returns
the IntlCalendar object that backs the DateFormat, even if a
constant was passed to the constructor, i.e., if an IntlCalendar
was not passed to the constructor.
* Added IntlDateFormatter::setTimeZone(). It accepts the usual values
for time zone arguments. If NULL is passed, the time zone of the
IntlDateFormatter WILL be overridden with the default time zone,
even if an IntlCalendar object was passed to the constructor.
* Added IntlDateFormatter::getTimeZone(), which returns the time zone
that's associated with the DateFormat.
* Depreacated IntlDateFormatter::setTimeZoneId() and made it an alias
for IntlDateFormatter::setTimeZone(), as the new ::setTimeZone()
also accepts plain identifiers, besides other types.
IntlDateFormatter::getTimeZoneId() is not deprecated however.
* IntlDateFormatter::setCalendar() with a constant passed should now
work correctly. This requires saving the requested locale to the
constructor.
* Centralized the hacks required to avoid compilation disasters on
Windows due to some headers being included inside and outside of
extern "C" blocks.

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Fixed problem in IntlCalendar debug handler

*is_temp was not being set.

Also deleted a redundant assignment to *is_temp in IntlTimeZone.

Added IntlCalendar::toDateTime()

Added IntlCalendar::fromDateTime()

IntlCalendar::fromDateTime(DateTime|string $dateTime[, string $locale)
intlcal_from_date_time(...)

If a string is given as the first argument,

Added IntlCalendar::fromDateTime()

IntlCalendar::fromDateTime(DateTime|string $dateTime[, string $locale)
intlcal_from_date_time(...)

If a string is given as the first argument, the method will try to
instantiate a new DateTime object and use that instead.

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Accept DateTimeZone where time zones are expected.

Also unified timezone handling in IntlCalendar::setTimeZone()
to that in the IntlCalendar and IntlGregorianCalendar constructors.

Compatibility with old versions of ICU (4.0+).

Supported Calendar methods new to ICU 49.

Initial checkin of calendar/timezone code.