Release v1.8.0

Main feature is the restructuring of the XML which does not allow backward compatibility.

What's Changed

• Types for Members by @dogukankaratas in #134
• Member Transverse Stiffeners added in Type For Members by @dogukankaratas in #136
• Truss Generator minor bug fixed by @dogukankaratas in #133
• XML Restructuring by @dogukankaratas in #137

Full Changelog: R-v1.7.0...R-v1.8.0