PyQt: Update sip to 6.5.0, reintroduce sip4 and simplify PyQt framework.

SIP:
As mentioned in the update from sip to sip5, this is a transitional version
to remove what is deprecated in sip4.
Sip6 completely removes the deprecated parts.
Unfortunately, some ports — mostly cura things — can not use sip6, so we
reintroduce sip4.

PyQt:
At the same time, we took the opportunity to simplify PyQT and propose only one
package as for devel/pyside2. */py-qt5-* have been merged — excepted chart,
networkauth and webengine — into devel/py-qt5-pyqt.

This allows us to be in adequacy with the packages that the author of these

*/py-qt5-*: Remove Digia's mention in pkg-descr

There was Trolltech, Nokia, Qt Project, Digia and today The Qt Company.
To avoid replacing the name at each structure, we will simply mention
that:
"PyQt5 is a set of Python bindings for Qt5 application framework"

One more small cleanup, forgotten yesterday.
Reported by:	lwhsu

Remove # $FreeBSD$ from Makefiles.

Remove empty PY_ENUM34 from ports using Python 3.6+

Update Qt/PySide2 to 5.15.2 / PyQt to 5.15.1 / SIP to 5.4.0
This commit combines several updates.

- Update Qt to 5.12.2
- Update PyQt to 5.15.1
- Since PySide 5.15.1 is broken with Qt 5.15.2, so PySide and Shiboken are also
updated to 5.15.2.
- Update sip to 5.4.0

SIP is a collection of tools  to create Python bindings for C and C++ libraries
and used by PyQt and wxPython. There are some changes with sip5 [1]:
- python 3.5+ is required
- sip drops support of old deprecated methods as sipdistutils & cie.
- this version breaks also PyQt5 extension ABI. SIP files will be installed in
${PYTHON_SITELIBDIR}/PyQt${_PYQT_VERSION}/bindings
- some ports will use the new pyqtbuilder package with the pyproject.toml setup.
Instead if the project have a setup.py, you should use sip-build to build it.
- if a port needs sip, it should also needs pysip. BTW, py-qt5-core requires
pysip, so that should be enough for PyQt packages.

Update PyQt to 5.15.0, py-sip to 4.19.24 and qscintilla2 to 2.11.5

- Update PyQt to 5.15.0, py-sip to 4.19.24 and qscintilla2 to 2.11.5
- Use pypi for PYQT [1]
- Add devel/py-qt5-sip (Don't use it for now. It will be used in future updates
of PyQt with py-sip >= 5)
- Add missing py-qt5 ports: comms/py-qt5-sensors, devel/py-qt5-location,
devel/py-qt5-remoteobjects, net/py-qt5-networkauth
- Strip libs
- Refactor *_PATH and *_PORT parts

[1] RiverBankComputing doesn't offer links to download latest version of some
ports

PR:		247369
Reviewed by:	tcberner
Differential Revision:	https://reviews.freebsd.org/D25749
Exp-run by:	antoine

Update py-sip to 4.19.21 and qscintilla2 to 2.11.4

  - Update py-sip to 4.19.21
  - Update qscintilla2 to 2.11.4
  - Replace MASTER_SITE_RIVERBANK with https versions
  - Replace QSCI2_DISTNAME to match with the new one

PR:		245308
Approved by:	tcberner (mentor)
Exp-run by:	antoine

Update PyQt5 to 5.12.1

- Upgrade sip to 4.19.15
- Upgrade qscintilla2 to 2.11.1
- Upgrade PyQt to 5.12.1

- From this version on www/py-qt5-webengine is unbundled and ships its own
distfile

PR:		236894
Exp-run by:	antoine

Fix Qt5 symbol version scripts to put the catch-all clause first.  When
a symbol matches multiple clauses the last one takes precedence.  If the
catch-all is last it captures everything.  In the case of Qt5 libraries
this caused all symbols to have a Qt_5 label while some should have
Qt_5_PRIVATE_API.  This only affects lld because GNU ld always gives the
catch-all lowest priority.

Older versions of Qt5Webengine exported some memory allocation symbols from
the bundled Chromium.  Version 5.9 stopped exporting these [1] but the
symbols were kept as weak wrappers for the standard allocation functions to
maintain binary compatibility. [2][3]  The problem is that the call to the
standard function in these weak wrappers is only resolved to the standard
function if there's a call to this standard function in other parts of
Qt5Webengine, because only then is there a non-weak symbol that takes
precedence over the weak one.  If there's no such non-weak symbol the call

Update PyQt5 to 5.11.3

- sip         upgrade to 4.19.13
- qscintilla2 upgrade to 2.10.8
- PyQt5       upgrade to 5.11.3

This has been worked on by arrowd and myself.

PR:		233954
Exp-run by:	antoine

pyqt: Change install directories for Python flavor support

* PyQt could not be installed for multiple Python versions at
  the same time, as there were conflicting files.

  This patch creates Python-version versioned directories for
  all these, and further installs binaries with a version number.

* Note, there might be some hickups for software that depends on
  on of the .so's provided by PyQt5, which might not be found
  anymore autmotically, and maybe need some LD-flaggery.

* Update PyQt5 to 5.10.1

* Mark www/py-qt5-webengine broken. It is unforuntately no longer
  compatible with the old qt5-webengine-5.9.4 we ship.

PR:		232745
Exp-run by:	antoine
Differential Revision:	https://reviews.freebsd.org/D8714

Replace bsd.qt.mk by Uses/qt.mk and Uses/qt-dist.mk

From now on, ports that depend on Qt4 will have to set
	USES=		qt:4
	USE_QT=		foo bar
ports depending on Qt5 will use
	USES=		qt:5
	USE_QT=		foo bar

PR:		229225
Exp-run by:	antoine
Reviewed by:	mat
Approved by:	portmgr (antoine)
Differential Revision:	-https://reviews.freebsd.org/D15540

Use PY_FLAVOR for dependencies.

FLAVOR is the current port's flavor, it should not be used outside of
this scope.

Sponsored by:	Absolight

Bump PORTREVISION in the PyQt5 ports after r460809.

- Update WWWs for all py-qt4* and py-qt5* ports
- Fix plists for py-qt5* for python3 case, adding missing .pyi files

Approved by:	portmgr blanket

Convert Python ports to FLAVORS.

  Ports using USE_PYTHON=distutils are now flavored.  They will
  automatically get flavors (py27, py34, py35, py36) depending on what
  versions they support.

  There is also a USE_PYTHON=flavors for ports that do not use distutils
  but need FLAVORS to be set.  A USE_PYTHON=noflavors can be set if
  using distutils but flavors are not wanted.

  A new USE_PYTHON=optsuffix that will add PYTHON_PKGNAMESUFFIX has been
  added to cope with Python ports that did not have the Python
  PKGNAMEPREFIX but are flavored.

  USES=python now also exports a PY_FLAVOR variable that contains the

Remove ${PORTSDIR}/ from dependencies, categories d, e, f, and g.

With hat:	portmgr
Sponsored by:	Absolight

At very long last land PyQt5 5.5.1 ports.

Add the required bits to Uses/pyqt.mk along with all the PyQt5 ports.
Thankfully this commit is mostly adding new ports, as the hard work was
already done in r403297 and r403662.

Huge kudos to Tobias Berner <tcberner@gmail.com> and, most importantly,
Guido Falsi (madpilot@) for their initial work on these ports (see D2910 in
Phabricator for an earlier version of the PyQt5 patch set).

PR:		204672