NOTE: From now on Boost is required in order to compile IfcOpenShell

====================================================================

- Use boost::optional for optional IFC arguments
- Use boost::uuid for the creation of GlobalIds
- New IfcGeomObjects setting to force alignment of TopoDS_Face normal to CCW orientation
- Removed static Ifc class, renamed to non-static IfcFile. IfcFile renamed to IfcSpfStream
- Introduced Logger class
- Introduced EntityBuffer class that keeps track of all writable entities created to add them all in once to the IfcFile class

src/ifcparse/IfcWrite.h

@@ -1,4 +1,4 @@
-/********************************************************************************
+/********************************************************************************
  *                                                                              *
  * This file is part of IfcOpenShell.                                           *
  *                                                                              *
@@ -189,6 +189,19 @@ namespace IfcWrite {
 		operator std::string() const;
 	};
 
+	// Accumulates all schema instances created from constructors
+	// This way they can be added in a single batch to the IfcFile
+	class EntityBuffer {
+	private:
+		IfcEntities buffer;
+		static EntityBuffer* i;
+		static EntityBuffer* instance();
+	public:
+		static IfcEntities Get();
+		static void Clear();
+		static void Add(IfcUtil::IfcSchemaEntity e);
+	};
+
 }
 
-#endif
+#endif