Copy / JSON application templating

[HarryAnkers]

It would be great if it was possible to template applications (a duplicate button) or to view them as JSON and then mass edit them that way (or YAML haven't looked at code for input method).

This would be useful for things like:

1. VSync on off
2. Steam Big Picture vs. Non-Big Picture
3. Virtual Display Mode vs. Non-Virtual Display Mode

Currently, it leads to a lot of copy and pasting. If there was an easier way to do this all at once for many applications, that would be nice.