bbswitch: upgrade to 0.7
calibre: upgrade to 1.0

Upstream insists on using private qt headers.
We do not want nixpkgs' qt to export those.
So I provided a small hack to take them directly from qt's source tarball.
I made sure everything uses the normal system qt and headers, except for the
1 .so file (qt_hack) that needs these private headers.

Because of this, there is barely any increate in size or buildtime.