This adds a function 'triggerFirst' to the file provider that triggers the first file provider in the model. That should then be the local file provider, but if the plug-in is disabled for some reason it would use another plug-in.
Contributes to issue CURA-7868.
When there is only one file provider (i.e. the local file provider), the Open File(s) will be a
simple item in the File menu.
When there are more than one file providers, the Open File(s) will become a submenu in the File
menu, which will contain all the file providers as submenu items.
CURA-7868
