net-misc/asterisk-extra-sounds: version bump + maintainer.

net-misc/asterisk-extra-sounds: version bump + maintainer.

EAPI was updated from 2 to 7.
version from 1.4.11 to 1.5.2.
L10N was ammended with en_GB (Additional language).
Taken maintainership + proxy maint.
Implement blacklist to avoid conflicts with net-misc/asterisk-core-sounds.
File and folder perms as per https://bugs.gentoo.org/507894 (not close)

Package-Manager: Portage-2.3.66, Repoman-2.3.11
Closes: https://bugs.gentoo.org/show_bug.cgi?id=687712
Signed-off-by: Jaco Kroon <jaco@uls.co.za>
Signed-off-by: Joonas Niilola <juippis@gentoo.org>