drop pid from the proc title

switch yornp_cb data back to an unsigned int it bothers me to keep alive a pointer inside a struct tab.

save session and reload it on startup

add extra parameter to yornp

free page contents on do_load_link to do that, move empty_vlist to wrap.c and provide a similar function for struct line*s.

add y-or-n-p; ask user when encountering invalid certs

big refactor: introduce the window abstraction - commands now take a struct window* instead of a raw tab - the struct ui_state is gone - using a window for the minibuffer too helps avoid code duplication - it will let us having more than one window on a tab! :DD It doesn't seem to have broken anything...

fix warnings

take an initial URL as first positional argument

don't include <err.h>, use the compat layer

persist certificate hashes to the known_hosts file

starting to implement TOFU popuplate an hash table with the certs and keep it in memory. Later, store the table in ~/.telescope/known_hosts and re-read back during startup.

(initial) add trust status following gemini://thfr.info/gemini/modified-trust-verify.gmi

de-duplication: factorize dispatch_imsg

fix various warnings, no functional changes now that we have a bounch of -Wxxx flags during compilation, let's fix everything.