media-sound/sonic-visualiser: 4.0.1 bump

media-sound/sonic-visualiser: 4.0.1 bump

1) eapi7
2) switched from xdg-utils to xdg
3) organized imports
4) added opus use flag
5) updated patches
6) removed piper related code in ebuild as it is not
   applicable anymore
7) updated and fixed tests (bug #633626)
8) added hand-made mime xml file as upstream provides
   just desktop files

Bug: https://bugs.gentoo.org/633626
Closes: https://bugs.gentoo.org/683088
Package-Manager: Portage-2.3.82, Repoman-2.3.20
Signed-off-by: Miroslav Šulc <fordfrog@gentoo.org>