Get libslic3r tests closer to passing

I can't get geometry tests to do anything useful. I've added extra
output, but it hasn't helped me figure out why they don't work
yet. That's also probably the last broken 3mf test doesn't work.

The config tests were mostly broken because of config name changes.

The placeholder_parser tests have some things that may-or-may-not
still apply to Orca.

src/libslic3r/PrintConfig.cpp

@@ -1,4 +1,5 @@
 #include "PrintConfig.hpp"
+#include "PrintConfigConstants.hpp"
 #include "ClipperUtils.hpp"
 #include "Config.hpp"
 #include "MaterialType.hpp"
@@ -686,7 +687,7 @@ void PrintConfigDef::init_common_params()
     def->tooltip = L("Slicing height for each layer. Smaller layer height means more accurate and more printing time.");
     def->sidetext = "mm";	// milimeters, don't need translation
     def->min = 0;
-    def->set_default_value(new ConfigOptionFloat(0.2));
+    def->set_default_value(new ConfigOptionFloat(INITIAL_LAYER_HEIGHT));
 
     def = this->add("printable_height", coFloat);
     def->label = L("Printable height");
@@ -833,7 +834,7 @@ void PrintConfigDef::init_fff_params()
     def->category = L("Quality");
     def->tooltip = L("Detour to avoid traveling across walls, which may cause blobs on the surface.");
     def->mode = comAdvanced;
-    def->set_default_value(new ConfigOptionBool(false));
+    def->set_default_value(new ConfigOptionBool(INITIAL_REDUCE_CROSSING_WALL));
 
     def = this->add("max_travel_detour_distance", coFloatOrPercent);
     def->label = L("Avoid crossing walls - Max detour length");
@@ -4540,7 +4541,7 @@ void PrintConfigDef::init_fff_params()
     def->min = 0;
     def->max = 100;
     def->mode = comAdvanced;
-    def->set_default_value(new ConfigOptionInt(0));
+    def->set_default_value(new ConfigOptionInt(INITIAL_RAFT_LAYERS));
 
     def = this->add("resolution", coFloat);
     def->label = L("Resolution");

src/libslic3r/PrintConfig.hpp

@@ -510,7 +510,7 @@ CONFIG_OPTION_ENUM_DECLARE_STATIC_MAPS(PerimeterGeneratorType)
 
 class DynamicPrintConfig;
 
-// Defines each and every confiuration option of Slic3r, including the properties of the GUI dialogs.
+// Defines each and every configuration option of Slic3r, including the properties of the GUI dialogs.
 // Does not store the actual values, but defines default values.
 class PrintConfigDef : public ConfigDef
 {

src/libslic3r/PrintConfigConstants.hpp

@@ -0,0 +1,7 @@
+#pragma once
+
+// These are here just for unit testing.
+
+#define INITIAL_LAYER_HEIGHT 0.2
+#define INITIAL_RAFT_LAYERS 0
+#define INITIAL_REDUCE_CROSSING_WALL false