This PR changes the identifier of files. While it's currently buffer numbers, file path is going to take the role.
Also, persistence functionalities (save/restore pinned and regular buffers) are moved to a dedicated file, because buffers and pinned buffers should not be dependent on the "file" module.
This PR changes the identifier of files. While it's currently buffer numbers, file path is going to take the role. Also, persistence functionalities (save/restore pinned and regular buffers) are moved to a dedicated file, because buffers and pinned buffers should not be dependent on the "file" module.