devel/py-python-dateutil: Move devel/py-dateutil to devel/py-python-dateutil

- Convert to USE_PYTHON=pep517
- Bump PORTREVISION of dependent ports for dependency change
- While I'm here, update audio/py-pyradio to use PYTHON_PKGNAMEPREFIX instead of
PKGNAMEPREFIX for *_DEPENDS

all: remove explicit versions in USES=python for "3.x+"

The logic in USES=python will automatically convert this to 3.8+ by
itself.

Adjust two ports that only had Python 3.7 mentioned but build fine
on Python 3.8 too.

finance/quickfix: mark BROKEN with PYTHON

libtool: compile:  c++ -DHAVE_CONFIG_H -I. -I../.. -I -I. -I.. -I../.. -I../C++
-DLIBICONV_PLUG -DPYTHON_MAJOR_VERSION=3 -Wno-unused-variable
-Wno-maybe-uninitialized -O2 -pipe -DLIBICONV_PLUG -fstack-protector-strong
-fno-strict-aliasing -DLIBICONV_PLUG -Wall -ansi
-Wno-unused-command-line-argument -Wpointer-arith -Wwrite-strings
-Wno-overloaded-virtual -Wno-deprecated-declarations -Wno-deprecated -std=c++0x
-MT _quickfix_la-QuickfixPython.lo -MD -MP -MF
.deps/_quickfix_la-QuickfixPython.Tpo -c QuickfixPython.cpp  -fPIC -DPIC -o
.libs/_quickfix_la-QuickfixPython.o
warning: unknown warning option '-Wno-maybe-uninitialized'; did you mean
'-Wno-uninitialized'? [-Wunknown-warning-option]
QuickfixPython.cpp:175:11: fatal error: 'Python.h' file not found
          ^~~~~~~~~~
1 warning and 1 error generated.

Reviewed by:	portmgr, vishwin, yuri
Differential Revision:	<https://reviews.freebsd.org/D40568>

Remove WWW entries moved into port Makefiles

Commit b7f05445c00f has added WWW entries to port Makefiles based on
WWW: lines in pkg-descr files.

This commit removes the WWW: lines of moved-over URLs from these
pkg-descr files.

Approved by:		portmgr (tcberner)

Add WWW entries to port Makefiles

It has been common practice to have one or more URLs at the end of the
ports' pkg-descr files, one per line and prefixed with "WWW:". These
URLs should point at a project website or other relevant resources.

Access to these URLs required processing of the pkg-descr files, and
they have often become stale over time. If more than one such URL was
present in a pkg-descr file, only the first one was tarnsfered into
the port INDEX, but for many ports only the last line did contain the
port specific URL to further information.

There have been several proposals to make a project URL available as
a macro in the ports' Makefiles, over time.

Fix PORTSCOUT=ignore:* uses throughout the tree

PORTSCOUT=ignore:1 is the only valid way syntax according to the
Portscout documentation. In disables the distfile version checks
completely. In order to ignore only certain version instead, it is
necessary to use other Portscout keys like skipv.

Also, remove the setting completely when it attempts to instruct
Portscout to skip versions older than the current one.

Approved by:	portmgr blanket

textproc/py-pykwalify: Ignore some old versions

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

Remove # $FreeBSD$ from Makefiles.

Update to 1.8.0

- Wordsmith the comment.
- Remove a comment about switching to CHEESESHOP. Let's stick to the actual
  upstream repository so that we have access to examples and tests.
- Use SETENV and TEST_ENV for the do-test target for consistency with other
  ports.

Release notes:
https://github.com/Grokzen/pykwalify/releases/tag/1.8.0

Drop python 2.7 support from a few ports

With hat:	portmgr

New port: textproc/py-pykwalify: Python lib/cli for JSON/YAML schema validation

pyKwalify is a YAML/JSON validation library.

This framework is a port with a lot of added functionality of the Java
version of the framework kwalify that can be found at
http://www.kuwata-lab.com/kwalify/

The schema this library is based on and extended from:
http://www.kuwata-lab.com/kwalify/ruby/users-guide.01.html#schema

WWW: https://github.com/Grokzen/pykwalify

Sponsored by:	BALLY WULFF Games & Entertainment GmbH