fix a recent regression where tog segfaults if Ctrl+l is used in the log view

fix horizontal scrolling of unicode in tog log view ok jamsek

fix horizontal scrolling bug in the blame view ok op@, jamsek

show last-modified date in the "tog ref" view if the 'm' key is pressed Patch by Mark Jamsek

implement horizontal scrolling for tog diff, blame, and log views Patch by Mark Jamsek

revert "clear the rest of the pack_fds pointers" There is no need to clear local variables before returning from a function. ok tracey

clear the rest of the pack_fds pointers

clear pack_fds pointer in tog's stop_blame() after closing

fix handling of pack_fds used by tog's log thread

move got_opentempfd out of got_repo_open. ok stsp@ thanks for all the help massaging this diff

re-add u/d keybindings as aliases for Ctrl-u/d, matching more(1) and less(1) patch by Mikhail

in tog, rework Ctrl+u/d to scroll by half a page, and drop d/u again This matches actual behaviour of less(1) for Ctrl+u/d, and leaves d/u free for potential future use. Suggested by naddy. Patch by Mark Jamsek

add less(1)-style key bindings for up/down to tog; patch by Mikhail

move creation of tempfiles outside of lib/diff.c ok tracey

portable: fix-up sha1.h include -portable doesn't need this directly.

tog: override SIGTERM and SIGINT handlers to avoid ncurses cleanup() handler ok thomas

inline struct got_object_id in struct got_object_qid Saves us from doing a malloc/free call for every item on the list. ok op@

portable: include sha1.h portably Don't directly include sha1.h as this isn't always in the same location across systems.

inline struct got_object_id in struct got_object_qid Saves us from doing a malloc/free call for every item on the list. ok op@

portable: freebsd: portably include sha1 The SHA implementation is found portably across systems, so don't include sha1.h directly.

inline struct got_object_id in struct got_object_qid Saves us from doing a malloc/free call for every item on the list. ok op@

pass an already open commit object to the blame callback ok op@

stop relying on commit cache for good performance of got_object_id_by_path() Instead of internally opening and closing the same commit object over and over again, require callers to pass an open commit object in. Avoids an inherent dependency on the commit object cache for reasonable performance. ok op@

portable: include support for MacOS This adds support for MacOS (Monteray onward, although should work on older MacOSes). The BSD wrapper for poll/ppoll has been lifted from the work the folks over at OpenSSH have done -- thanks!

const-ify command and option tables ok stsp