* 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).
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