prusa-slicer: renamed from slic3r-prusa3d and updated 1.41.3 -> 2.0.0

The slic3r-prusa3d package was renamed by upstream to PrusaSlicer with
the 2.0.0 release to reduce confusion with the slic3r package.

We compile against wxGTK 3.0, as with 3.1 the application crashes (see