Store / retrieve layer height profile from the AMF file.

Reset the layer height profile when changing a print profile to an incompatible one.
Reset button on the layer height bar.
Fixed an update issue on zooming by a scroll wheel.
Fixed an issue when loading an AMF file: Object names are now retained.

lib/Slic3r/GUI/Plater/3D.pm

@@ -83,6 +83,11 @@ sub set_on_instances_moved {
     $self->{on_instances_moved} = $cb;
 }
 
+sub set_on_model_update {
+    my ($self, $cb) = @_;
+    $self->on_model_update($cb);
+}
+
 sub update {
     my ($self) = @_;