KDE: update WWW for meta ports

net/kdenetwork: restore KGET and add KTORRENT options

KDE: It goes to 6!

This megacommit merges all the work from
https://github.com/freebsd/freebsd-ports-kde/tree/kde-it_goes_to_6
Specifically:
- KDE Plasma 6 ports updated to 6.2.5
- KDE Applications ports updated to 24.12.0
- Development ports of KDE Applications removed
- A lot of various ports switched to Qt 6 by default
- Some KDE Frameworks 5 and Plasma 5 ports are adapted to be coinstallable
  with their 6 counterparts

PR:		284351
Exp-run by:	antoine
Pull Request:	https://github.com/freebsd/freebsd-ports/pull/341

Co-authored-by:	Max Brazhnikov <makc@FreeBSD.org>
Co-authored-by:	Kenneth Raplee <kenrap@kennethraplee.com>
Co-authored-by:	Jason E. Hale <jhale@FreeBSD.org>
Co-authored-by:	Gleb Popov <arrowd@FreeBSD.org>

audio/opus: bump consumers after update to 1.4

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

Remove # $FreeBSD$ from Makefiles.

Update KDE Applications (release-service) to 20.04

KDE's April 2020 Apps Update

A new bundle of KDE applications is here! In these releases, you can expect to
find more features, stability improvements, and more user-friendly tools that
will help you work more effectively.

There are dozens of changes to look forward to in most of your favorite
applications. Take Dolphin, for example. Windows Samba shares are now fully
discoverable.

On the topic of playing music: the Elisa music player is adding features by
leaps and bounds. This release brings a new "Now Playing" view, easy
accessibility through the system tray, and an option to minimize the playlist
whenever you want. Thanks to the recently-added visual shuffle mode, it's much
easier to rearrange your music in the playlists.

These are just the highlights of what's new in KDE's applications this month.
Read on to find out about everything we've prepared for you.

Announcement:
	https://kde.org/announcements/releases/2020-04-apps-update/

net/kdenetwork: readd kopete as an option

PR:		245615
Reported by:	tigersharke@gmail.com

Update KDE Applications to 18.12.2

[1] https://www.kde.org/announcements/announce-applications-18.12.2.php
[2]
https://www.kde.org/announcements/fulllog_applications-aether.php?version=18.12.2

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

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

Update KDE Applications to 18.04.0

* Pin multimedia/kdelive at 17.12.3 until we import the mlt update from the
dev-repo.

Add the KDE metaports

* add multimedia/dragon (was missing)
* add the meta ports for the categories
* add x11/kde5 [yeah, we know, there technically is no "KDE 5"]