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.

URLs like gopher://example.com/1 weren't matched as type 1 before and worse, they weren't really loaded, even thought the spinner started (that's behaviour is from push_button). Now matching of items types is better and a (simple) error page is loaded on unknown types selector.

Initially telescope only supported about:* pages and gemini, so it made sense to set TS_VERIFIED on about pages. Now, also various non-tls protocols and TS_UNKNOWN is used more, so is more coherent to use it also for about pages.

The computed request was discarded because we passed `path' to make_request. Passing NULL here makes the net proc use our computed request string. There was an error in the computed request btw, where \r\n were strcpy'd instead of cat'd.

this allows cmd_push_button_new_tab to open the new tab right *after* the current one, instead that always at the end.