[request] Add import/export node configuration to share with others

[flobotics]

hi, it would be nice to have a import/export button, to import/export node-configurations from others.

So, people could share the config file instead of pictures of the node-setup.

Also , with this, there could be published some node configuration prototypes, directly with meshroom, for some special setups.

[natowi]

This is possible with .mg files, just open it in Notepad++ and remove your personal paths from it