Format standardization

[mgord9518]

In this thread, we should discuss the future of aisap not only as a program, but as a standard way to provide AppImage permissions that others may implement themselves, giving users a consistent experience.

aisap currently does the following:

1. Looks in ~/.config/aisap for user-provided desktop entries, which contain overridden permissions
2. Reads from a trusted JSON database in this repo profiles/profile_database.json. This is embedded directly into aisap
3. Looks for permissions in the application bundle's desktop entry that the developer can request

Is this the way forward, or should we consider other options? Can we learn anything from Flatpak, or even re-use its permission-storing scheme for free system integration?

[xplshn]

I'm in favor of having sandbox options live at .desktop

[Samueru-sama]

Having it the .desktop is good, also maybe looking in $XDG_DATA_HOME/applications for a matching .desktop that contains permissions would be great.

Btw @mgord9518 I'm holding upstreaming the changes that @xplshn made that fixes the hardcoded XDG vars because right now no sanity check are done on the vars that get returned.