Rename geometry and serializer files

Apply the rename manifest, normalize serializer filenames to the classes they define, and update includes and CMake source lists.

Generated with the assistance of an AI coding tool.

src/examples/IfcAdvancedHouse.cpp

@@ -50,7 +50,7 @@
 #include "ifcparse/hierarchy_helper.h"
 #include "plugin/plugin.h"
 
-#include "../ifcgeom/Serialization/Serialization.h"
+#include "../ifcgeom/serialization/serialization.h"
 
 #if USE_VLD
 #include <vld.h>

src/examples/IfcOpenHouse.cpp

@@ -47,7 +47,7 @@
 #include "ifcparse/hierarchy_helper.h"
 #include "plugin/plugin.h"
 
-#include "../ifcgeom/Serialization/Serialization.h"
+#include "../ifcgeom/serialization/serialization.h"
 
 #if USE_VLD
 #include <vld.h>

src/examples/IfcParseExamples.cpp

@@ -73,7 +73,7 @@ typedef IfcSchema::IfcBuiltElement element_t;
 std::string format_string(const ifcopenshell::attribute_value& argument) {
 	// Argument is a runtime tagged variant for the various data types in a IFC model,
 	// in this particular case we only care about flattening it to a string.
-	// @todo mostly duplicated from XmlSerializer.cpp
+	// @todo mostly duplicated from xml_serializer.cpp
 	if (argument.isNull()) {
 		return "-";
 	}