merge tofu_add and save_cert into tofu_save

move bookmark_page off fs.c

merge the fs into the ui process The previous separation between the fs and ui process wasn't that good. The idea was to have a `ui' process tightly sandboxed, but it was a lie actually. `ui' was one imsg away from making internet connections and accessing data on the disk, so it wasn't really limited in (almost) any way. Furthermore, having to serialize data to/from the fs proc started to become not really maneagable. As a first step to fix this situation, join the fs and ui process.

style

partial revert of "abstract over evbuffers" partial revert of commit d54dd8160b88709f3d243e1410a781e5de7fc187. We don't really need an abstraction over "printf-like" things. I can just use plain old FILEs. open_memstream (which conforms to POSIX.1) is what I should have used from the beginning in my mcache implementation.

add write-buffer saves a page to the disk. Also, changes the order of the downloads so the new one is always at the top.

persist list of visited URLs to the disk Persist a generalized history of visited URL in history_file and try to keep it in sync during telescope usage and shutdown.

const-ify some tables

remote open: open an url into telescope from outside of it if telescope is started with an url while there is already another instance of it running and the -S flag is not provided, the link will be automagically opened into the running instance of telescope. Telescope now listens on a UNIX domain socket in ~/.telescope/ctl (or ~/.cache/telescope/ctl if XDG is used) for commands.

make `reply-last-input' work on gopher too

reply-last-input: reply input requests on demand Telescope now remebers the last URL (per tab!) that replied with 1X (input request.) The new command reply-last-input allows to resend a query to that URL. It's particularly useful with capsules that make a heavy uses of 10 replies (search engines or similar, interactive pages, etc) because it both saves a network roundtrip and the user from looking for the "search" link all across the page ;-) idea from a conversation with thfr@, thanks!

ui_require_input: take a fn pointer instead of the protocol number

move load_page_from_str to telescope.c I'd like to use parser{,_gophermap,_gemtext}.c in standalone testing programs, and this function is getting in the way since it depends on ui.c

correctly save scrolling position Before we didn't save the scrolling position before a refresh (nohist=1) and that's annoying. This saves the scrolling position only in the correct case, which is when changing from a page to another, expect when switching to TAB_LAZY off.

move TAB_LAZY flipping from switch_to_tab in load_url load_url needs to know when a tab passes from lazy to not lazy to correctly saves the scrolling position (see follow-up commit.)