got_imsg_send_remote_ref: use struct instead of buffer for id ok stsp@

got_imsg_send_ref: use struct instead of buffer for id ok stsp@

got_imsg_fetch_ref: use struct instead of buffer for id ok stsp@

got_imsg_fetch_have_ref: use struct instead of buffer for id ok stsp@

gotd, gotadmin: install packfiles and index files as 0444 gotd used 0600 (due to mkstemps(3)), gotadmin 0644; change it to 0444 since packfiles shouldn't change once created. Mirrors what git does. ok stsp@

tog: add horizontal scroll support to the tree view Suggested by op. tog now supports hscroll in all views so move corresponding keymap docs in tog(1) to global space (this was already the case in tog runtime help). While here, remove some copypasta with a new subroutine to handle hscroll input. ok op@ and stsp@

tog: add horizontal scroll support to the ref view ok op@ and stsp@

fix OB1 in tog ref and tree views causing wrapped lines While here, draw to the last column in tog help. ok op@ and stsp@

update backout/cherrypick regress for worktree UUID output ok stsp@

zap unused parameter in got_worktree_rebase_complete() ok stsp@

return err instead of NULL in got.c:print_backup_ref() ok stsp@

free cwd in cmd_backout() and cmd_cherrypick() ok stsp@

gotwebd: delete always-true check ok stsp@

got_imsg_raw_delta: use struct instead of buffer for id ok stsp@

got_imsg_raw_delta_request: use struct instead of buffer for id ok stsp@