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/IfcUtil.cpp

@@ -111,6 +111,7 @@ bool IfcUtil::valid_binary_string(const std::string& s) {
 	return true;
 }
 
+#ifndef IFCPARSE_NO_REGEX
 boost::regex IfcUtil::wildcard_string_to_regex(std::string str)
 {
     // Escape all non-"*?" regex special chars
@@ -124,6 +125,7 @@ boost::regex IfcUtil::wildcard_string_to_regex(std::string str)
     boost::replace_all(str, "*", ".*");
     return boost::regex(str);
 }
+#endif
 
 void IfcUtil::sanitate_material_name(std::string &str)
 {