Import/Export Interfaces

[liamcottle]

Add the ability to import and export interfaces from the UI.

• User should be able to export a configuration file with selected, preconfigured interfaces.
• User should be able to import a configuration file and select which interfaces they want to import from it.
• Add buttons to select all and deselect all interfaces for faster import/exporting.
• Must ensure interface names are unique, as you can't have multiple interfaces with the same name in the config file.

This will allow users to configure interfaces on their client, and then click export to generate a shareable config file. Which will improve the experience for less technical users as they will not need to manually type in interface names, types, and connection details.

[HotMicSystems]

This will be great for setting up friends, good work!