replace has_prefix with strncmp

move load session stuff to session.c

merge update_cert and tofu_update into tofu_update_persist

merge tofu_add and save_cert into tofu_save

constify

move bookmark_page off fs.c

sync changelog

generate session/history_file atomically if an i/o error occurs while writing those files, they may end up being corrupted or truncated. Use the approach already used for tofu, write a temp file and rename(2) it to the correct position.

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.

provide parser_parsef: a printf-like function for parsers

sync changelog

recompute completions after minibuffer history navigation

recompute_completions: use the history too when viewing it

allow to select a previous history item

minibuffer_compl_text: honour the history items