Remove app-emulation/crossover-bin

It's now provided in ::gentoo.
Remove sys-apps/paludis

It's now provided in ::gentoo.
x11-theme/oxygen-gtk3: bump to version 1.4.0
virtual/linux-sources: bump to version 1

Add firmware use flag.
Remote sys-fs/jmtpfs

Use kio-mtp with libmtp on KDE or mtpfs.
Remove sys-apps/openrc

It is masked by systemd profile.
Remove app-emulation/swine

Use crossover-bin instead.