MeshLab-2020.07

Changelog:

• new plugin "Global Registration" based on OpenGR library
• option to reverse wheel direction
• snap package allows to associate file extensions and to open files on external disks
• u3d exporter is now more stable and works on every platform
• removed support for XML plugins and QtScript dependecy
• VisualSFM (and some other formats) output *.nvm, *.rd.out projects supported by meshlabserver
• various bugfixes