save externals toxes + toe Shortcut

[GuillaumeNeyret]

Adding a shortcut (or a button on the ctrl + w interface) to save all the external toxes and the toe at the same time could be a nice new feature.

I usually work with all the externalized toxes used in my project and makes some changes and I have to make sure to save all the toxes one by one before saving the entire project.
Sometimes it can be very frustrating to forget to save a modified tox when saving the project and losing everything.

Maybe no a specific shortcut but an option on the base_save parameter that allow you to enable a popup windows "Do you want to also save all externalized comp ? (YES/NO) when saving the project.

Maybe it is not the way this tools is meant to be used so don't hesitate if you have a better workflow with it