In a noninteractive shell, asynchronous commands ignore SIGINT and
SIGQUIT. We typically use such shells to feed fifo buffers which we
do want to cancel them on Control-C. Make it so.
Same for SIGQUIT; that one is not typically used but I expect that
along the Kakoune server it kills any child processes that (haven't
been daemonized).
Note that for unknown reasons, Bash already doesn't ignore SIGINT in
async processes that use "eval".
Note that Dash has a bug that prevents this from working;
proposed fix is at
https://lore.kernel.org/dash/20240329153905.154792-2-aclopte@gmail.com/
(While at it balance out some parens, to help the m command)
`grep-next-match` works only on the `*grep*` buffer so it can't be used
on buffers that were preserved by renaming or on other grep-flavored
buffers created by 3rd party plugins kakoune-find and kakoune-lsp,
like `*find*` and `*references*`.
Let's generalize `grep-next-match` with a `jump-next` command that
takes a buffer argument.
This renames some options but I think they're not commonly used.
kakoune-lsp is an exception that uses grep_current_line but it's no big
deal, things will fail loud and early if options are missing.
Since grep.kak and friends now depend on jump.kak, move the jumpclient
declaration there as well.
`-atomic` becomes `-method replace` and `-method overwrite` is now
supported explicitely instead of only available through the
writemethod option.
Fixes#3827
