Allow built-in livereload while stopping on SIGHUP

[CosmicToast]

In particular, I'm interested in -l but still dying on SIGHUP.
Use-case: asynchronous starting and stopping of devd through zsh zpty.
When zsh's zpty exits (zpty -d name), it sends a SIGHUP to the backgrounded process.
I'm perfectly fine with the built-in "anything under the root directory" live reloading, but would rather avoid having to explicitly use pkill when I could simply have an on-down hook.

Alternatively, maybe add a flag that overrides -L|-l|-w's special treatment of SIGHUP (so I'd use, for example, -lh, where h would stand for HUP.