Warn before running executables

It pertrains not only to Appimages, but also to other binaries that the user may run.
When clicking or hitting Enter on a binary, hash whatever file the user is trying to run against a database, and if it checks out, let it run.
If not, show the message akin to what Terminal is showing when trying to copy the sudo command:


On "Run and remember" the binary's hash is saved into the database for future use.

The user should be able to disable it in Privacy and security Switchboard tab (or disable it for a directory) - because development requires running different binaries all the time.