switchboard-plug-bluetooth from X11:Pantheon project

For openSUSE Factory run the following as root:

zypper addrepo https://download.opensuse.org/repositories/X11:Pantheon/openSUSE_Factory/X11:Pantheon.repo
zypper refresh
zypper install switchboard-plug-bluetooth

For 15.6 run the following as root:

zypper addrepo https://download.opensuse.org/repositories/X11:Pantheon/15.6/X11:Pantheon.repo
zypper refresh
zypper install switchboard-plug-bluetooth

For 16.0 run the following as root:

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