Mk/Uses: always use colon for build/run suffix

Most USES use a colon for build/run(/test) suffixes. Change kde.mk,
qt.mk and pyqt.mk to do the same, and update all ports using that.

Document in CHANGES.

PR:			266034
Exp-run by:		antoine
Approved by:		tcberner (mentor)
Differential Revision:	https://reviews.freebsd.org/D36349

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.

*/*: bump all consumers after recent boost upgrade

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.

math/zegrapher: Update the PORTSCOUT tag

PORTSCOUT=ignore:continuous doesn't work for some reason, and portscout still
shows 'continuous' as the next version.

math/zegrapher: Update 3.1.1 -> 3.1.1.20200921

Reported by:	portscout

math/zegrapher: Update 3.1 -> 3.1.1

Reported by:	portscout

math/zegrapher: Update 3.0.2 -> 3.1

Reported by:	portscout

devel/boost-*: update to 1.72.0

Changes:	http://www.boost.org/users/history/version_1_72_0.html
PR:		241449
Exp-run by:	antoine
Differential Revision:	https://reviews.freebsd.org/D22136

Add USES=xorg USES=gl, ports categories m

Add USES=xorg and USES=gl to ports in categories starting with 'm'
While here, try to sprinkle other USES (mostly gnome and sdl) as needed.

devel/boost-*: update to 1.71.0

Changes:	http://www.boost.org/users/history/version_1_71_0.html
PR:		238827
Exp-run by:	antoine
Differential Revision:	https://reviews.freebsd.org/D20774

Bump PORTREVISION for ports depending on the canonical version of GCC
as defined in Mk/bsd.default-versions.mk which has moved from GCC 8.3
to GCC 9.1 under most circumstances now after revision 507371.

This includes ports
 - with USE_GCC=yes or USE_GCC=any,
 - with USES=fortran,
 - using Mk/bsd.octave.mk which in turn features USES=fortran, and
 - with USES=compiler specifying openmp, nestedfct, c11, c++0x, c++11-lang,
   c++11-lib, c++14-lang, c++17-lang, or gcc-c++11-lib
plus, everything INDEX-11 shows with a dependency on lang/gcc9 now.

PR:		238330

devel/boost-*: update to 1.70.0

Changes:	http://www.boost.org/users/history/version_1_70_0.html
PR:		235956
Exp-run by:	antoine
Differential Revision:	https://reviews.freebsd.org/D19303

Fix build on gcc-based architectures:

  cc1plus: error: unrecognized command line option "-std=gnu++11"

Approved by:	portmgr (tier-2 blanket)

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

devel/boost-*: update to 1.69.0

Changes:	http://www.boost.org/users/history/version_1_69_0.html
PR:		232525
Exp-run by:	antoine
Differential Revision:	https://reviews.freebsd.org/D17645

Change x11/xorgproto to become a build dep

Change x11/xorgproto to become a build time dependency when added to
USE_XORG.  Change the dependency to be on the port, rather than a file the
port installs.
Fix fallout.
Bump portrevision on depending ports.

PR:		230909
Reviewed by:	eadler
Approved by:	portmgr (antoine)
Obtained
from:	https://github.com/FreeBSDDesktop/freebsd-ports/tree/feature/xorgproto
exp-run:	antoine
Differential Revision:	https://reviews.freebsd.org/D16906

devel/boost-*: update to 1.68.0

- Switch to C++14 for libboost_system to support C++14 consumers

Changes:	http://www.boost.org/users/history/version_1_68_0.html
PR:		229569
Exp-run by:	antoine
Differential Revision:	https://reviews.freebsd.org/D16165

New port: math/zegrapher: Software for plotting mathematical objects