IfcParse dynamic linking, IFCPARSE_NO_REGEX, fixes for three memory leaks (#76)

* CMake: moved setting link directories before all the projects.

* Added IfcParse_Export header for declaring export macro.

* Added IFCPARSE_STATIC_DEFINE macro to all projects.

* Added include for export macro to swig file.

* Added IfcParse_EXPORT macro for all classes in headers generated by express parser.

* Allow removing boost.regex dependency by defining macro IFCPARSE_NO_REGEX.

* Fixed bug in deletion of ICU converter.

* Added export macro to most of the classes across headers

* Fixed memory leak: delete nested IfcAbstractEntity in EntityArgument.

* Fixed memory leak in destructor of IfcWritableEntity (args values).

src/ifcparse/IfcHierarchyHelper.h

@@ -30,6 +30,8 @@
 
 #include <map>
 
+#include "../ifcparse/IfcParse_Export.h"
+
 #ifdef USE_IFC4
 #include "../ifcparse/Ifc4.h"
 #else
@@ -40,7 +42,7 @@
 #include "../ifcparse/IfcWrite.h"
 #include "../ifcparse/IfcGlobalId.h"
 
-class IfcHierarchyHelper : public IfcParse::IfcFile {
+class IfcParse_EXPORT IfcHierarchyHelper : public IfcParse::IfcFile {
 public:
 	template <class T> 
 	T* addTriplet(double x, double y, double z) {