runit user service files

Various runit service files for per-user services. May need to be modified to work on your system.

Helper scripts:

log: symlink as the run script in your service's log directory to enable logging to $SVLOGDIR. If unset, defaults to ~/.local/log/
utils/setup-supervise.zsh: run to create symlinks for supervise directories, so they are created in $XDG_RUNTIME_DIR
utils/new-service: create a new service, executing the given command line. Accepted options before service name:
- -l, --log: create a log directory and symlink log script
- -i PROC, --import-env PROC: include import-env script and import environment from process PROC
Example
```
utils/new-service -l my-daemon --foreground -a -b -c
```
utils/svlogs: like svlogtail for user services. ZSH completion file available in utils/completions