Added a project specific config to the PresetBundle class.

This project specific config will be stored into the config.ini,
into .3mf and .amf and .gcode,
and recover it from the same files.

xs/src/slic3r/GUI/PresetBundle.cpp

@@ -32,6 +32,9 @@
 
 namespace Slic3r {
 
+static std::vector<std::string> s_project_options {
+};
+
 PresetBundle::PresetBundle() :
     prints(Preset::TYPE_PRINT, Preset::print_options()), 
     filaments(Preset::TYPE_FILAMENT, Preset::filament_options()), 
@@ -56,6 +59,8 @@ PresetBundle::PresetBundle() :
     this->filaments.load_bitmap_default("spool.png");
     this->printers .load_bitmap_default("printer_empty.png");
     this->load_compatible_bitmaps();
+
+    this->project_config.apply_only(FullPrintConfig::defaults(), s_project_options);
 }
 
 PresetBundle::~PresetBundle()
@@ -223,6 +228,7 @@ DynamicPrintConfig PresetBundle::full_config() const
     out.apply(FullPrintConfig());
     out.apply(this->prints.get_edited_preset().config);
     out.apply(this->printers.get_edited_preset().config);
+    out.apply(this->project_config);
 
     auto   *nozzle_diameter = dynamic_cast<const ConfigOptionFloats*>(out.option("nozzle_diameter"));
     size_t  num_extruders   = nozzle_diameter->values.size();
@@ -412,6 +418,9 @@ void PresetBundle::load_config_file_config(const std::string &name_or_path, bool
         }
     }
 
+    // 4) Load the project config values (the per extruder wipe matrix etc).
+    this->project_config.apply_only(config, s_project_options);
+
     this->update_compatible_with_printer(false);
 }