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

*/*: PyQt Update qscintilla2 to 2.13.0 and py-qt5-sip to 12.9.0

Changes:
  - https://riverbankcomputing.com/news/QScintilla_2.13.0_Released
  - https://www.riverbankcomputing.com/hg/sip/raw-file/tip/NEWS
PR:	257308
Exp-run by:	antoine

devel/qscintilla2: Update to 2.12.1

Changelog:
	https://riverbankcomputing.com/news/QScintilla_2.12.1_Released

PR:		257002
Exp-run by:	antoine

*/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"

graphics/mesa-libs: Bump reverse deps for libglvnd

Per discussion with bapt on helping pkg handle the changing of these
deps and avoiding impossible upgrade senarios.

PR:		246767
Reviewed by:	manu, bapt
Approved by:	x11
Differential Revision:	https://reviews.freebsd.org/D30824

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

Remove # $FreeBSD$ from Makefiles.

PyQt5: Update PyQt5 to 5.15.3, QScintilla2 to 2.12.0, py-qtbuilder to 1.9.0

* PyQt5: update to 5.15.3

This is a minor feature and bug-fix release. There are corresponding releases of
the other PyQt5-related packages.

 - Added the missing QImage.setAlphaChannel().
 - Support for the QtNetworkAuth library has been moved to a separate
PyQtNetworkAuth package.
 - Wheels no longer bundle the corresponding Qt libraries and instead
automatically install them from an external wheel.

* QScintilla2: update to 2.12.0

This adds support for Qt6 and removes support for Qt4.

 - Change the new distname (again)i due to a conflict
 - Use the new sip-build system

* devel/py-qtbuilder: update to 1.9.0
* devel/py-sip: fix flavor for sip-distinfo

PR:		253865
Exp-run by:	antoine

Update qscintilla2 to 2.11.6

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