Move the .pid files for Hypnotoad/Minion/Shinobu outside of /script

[Difegue]

The app currently freezes the Proc::Simple objects for both Shinobu and Minion processes into shinobu/minion.pid files in the app's working directory, which is usually /script. This behavior was implemented kinda following what Hypnotoad was already doing with its own .pid file.

This can fail if the directory is write-protected(like in brew tests), so it'd be better to move those files to /tmp, which probably fits better anyway since they're transient.

For Hypnotoad, it'll be necessary to modify launcher.pl in order to set pid_file:
https://docs.mojolicious.org/Mojo/Server/Hypnotoad#pid_file

[Difegue]

.pid files are now in the application's temporary directory, which can be moved thanks to LRR_TEMP_DIRECTORY.