When enabled with the -S (or --safe) flag, prevent telescope from writing files to the disk.

improve the download procedure by pre-filling the minibuffer with /tmp/<file-name>. At the moment ``/tmp/'' is hardcoded. Idea from a conversation with hurricane, thanks!

some gopher servers requires the selector to start with a slash. Or maybe it's the other way around, and some servers are too much forgiving.

Create a file ~/.telescope/crashed on startup and unlink it on shutdown. If it's present on startup, it means that last time we crashed. It's like the ``dirty'' bit on filesystems to guard for unproper unmounts.

This is achieved by calling `autosave_hook' in interesting places, like new_tab or free_tab. It'll set up a timer to later persist the session. This is particularly useful to avoid loosing tabs on the event of a crash or unexpected system halt, or other similar event.