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In C++20 there are new classes that have member functions named emit().
c.f.:
https://lists.qt-project.org/pipermail/development/2020-February/038812.html
https://en.cppreference.com/w/cpp/io/basic_osyncstream/emit

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This is re-adding parsing for color property, but with
conditional compilation since this property is supported
only from libical >= 3.0.0.

CONFERENCE property is specified in RFC7986, section 5.11 and is designed
to specify information about accessing a conferencing system.

It exists only in MemoryCalendar but is generic enough to be in Calendar
instead. We cannot move it because of binary compatibility, but we can
copy it and remove the old one in KF6.

This reverts commit c5d7bc89.

For some reason, CI had trouble to compile toString(calendar),
making toString(KCalendarCore::MemoryCalendar::Ptr&) and
toString(const KCalendarCore::Incidence::Ptr&) ambiguous.
Add the optional argument to the first call so the ambiguity
is raised.

MemoryCalendar::rawTodos() can already use open bounds, but
rawEvents() cannot. This patch is fixing this and is adding
a non-regression test for events.

License change confirmed by relicensecheck.pl and manual review
of copyright holders in license header.

When setting custom a property with CustomProperties::setNonKDECustomProperty,
save properties starting with X-KDE-VOLATILE- into the mVolatileProperties
member. This is symetrical with removeNonKDECustomProperty().

- test that the transitions match the tzdump output
- there are 2 transitions in the relevant timeframe

See https://community.kde.org/Frameworks/Frameworks_Logging_Policy

- The "short form" timezone "GMT" does not always exist on FreeBSD. Use short form "UTC" instead.
- While here, add a little test that the named timezone is valid.
- Make tests a little more explicit as to what they're testing.

The value of the `start` parameter does not affect the all-day setting.