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/IfcLateBoundEntity.h

@@ -22,6 +22,8 @@
 
 #include <string>
 
+#include "../ifcparse/IfcParse_Export.h"
+
 #include "../ifcparse/IfcUtil.h"
 #include "../ifcparse/IfcWrite.h"
 #include "../ifcparse/IfcWritableEntity.h"
@@ -32,7 +34,7 @@ namespace IfcParse {
 	// that in the IfcFile class the distinction what entity type to be created is 
 	// no longer necessary and weird diagonal casts when creating geometry from
 	// IfcLateBoundEntities are eliminated.
-	class IfcLateBoundEntity : public IfcUtil::IfcBaseEntity {
+	class IfcParse_EXPORT IfcLateBoundEntity : public IfcUtil::IfcBaseEntity {
 	private:
 		IfcWrite::IfcWritableEntity* writable_entity();
 		void invalid_argument(unsigned int i, const std::string& t);