[qbs] Rewrite PkgProbe/QutimProbe; Rewrite everything using PkgProbe

[nico-izo]

That's simple:

instead of this:

    cpp.dynamicLibraries: ["messaging-menu-qt5"]

(and this)

we should have something like that:

Depends {
   name: "messaging-menu-qt5"
}

And NOT this: https://github.com/euroelessar/qutim/blob/f4f19187771e908e3f30e77c725b67c729e367d2/src/plugins/generic/offtherecord/offtherecord.qbs#L13