graphics/cloudcompare: Update 2.12.4 => 2.13.2, take maintainership

• Add WWW for source code repository.
• Static tarball is available, but not used, as GH_TUPLE is needed for bundled external libraries and 3-rd party plugins.
• GL is needed for the main application, not for the plugins only.
• Build PLUGIN_IO_QPDAL unconditionally, just like other plugins.
• Supply *.desktop with *.png files from the previous version, as upstream doesn't ship them anymore. Fix post-install accordingly.
• Fix plugin path detection actually enabling plugins autoloading.
• Improve COMMENT and pkg-descr

Reviewed by: arrowd@
Approved by: db@, yuri@ (Mentors, implicit)
Differential Revision: https://reviews.freebsd.org/D55434