commiter needed for pecl-imagick merge (6 and 7) PR 268833

For historic reason there are pecl-imagick depending on ImageMagick 6 
and pecl-imagick-im7 depending on ImageMagick 7. As far as I know no 
ports depend on pecl-imagick with ImageMagic 6 by default now so it is 
safe to remove pecl-imagick-im7 and use pecl-imagick with the new 
USES=imagick to build with the right ImageMagick version.
It should also be added to MOVED and there should be small update of 
dependencies in Makefile of ports: Nextcloud, Piwigo and Wordpress.
I created one large patch for all this steps and also small patches for 
each of this step alone.
Please check it / test it and commit it.
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=268833

(my last patches for pecl-imagick were left uncommitted from March 2023)

Kind regards
Miroslav Lachman