There was a bug in unit tests that led to generating the wipe tower with non-normalized preset.
This caused out-of-bounds access into max_layer_height vector in fill_wipe_tower_partitions.
The problem surfaced in https://github.com/prusa3d/PrusaSlicer/issues/2288.
I quickly patched additional normalization of the preset to prevent this from happening.
Also, an assert in the same function turned out to trip on one of the tests.
This one was commented out for now and will (hopefully) be looked into later.
Function Print::apply_config was renamed to apply_config_perl_tests_only so everyone
sees its current purpose and does not mistake it for the more important Print::apply.
Don't arrange the objects on the build plate. The model coordinates
define the absolute positions on the build plate.
The option --print-center will be ignored.
Also there is a fix in the command line invocation of --duplicate-grid
so it will run, but still there is something broken there and the results
are not correct.
Some code copied from xs-model branch.
Also:
* Generate ::Ref classes programatically.
* Add separate __REGISTER_CLASS macro
(for use where forward declaration won't work, i.e. typedefs)
