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/IfcFile.h

@@ -23,6 +23,8 @@
 #include <map>
 #include <set>
 
+#include "../ifcparse/IfcParse_Export.h"
+
 #include "../ifcparse/IfcParse.h"
 #include "../ifcparse/IfcSpfHeader.h"
 
@@ -30,7 +32,7 @@ namespace IfcParse {
 
 /// This class provides several static convenience functions and variables
 /// and provide access to the entities in an IFC file
-class IfcFile {
+class IfcParse_EXPORT IfcFile {
 public:
 	typedef std::map<IfcSchema::Type::Enum, IfcEntityList::ptr> entities_by_type_t;
 	typedef std::map<unsigned int, IfcUtil::IfcBaseClass*> entity_by_id_t;