Prolific v27.0.0-alpha.1

• Truly synchronous writes. Closes #1038. Closes #1023. Closes #1017. Closes
  #1016. Closes #1015. Closes #1014.
• Track which pids have already exited for a bit. Closes #1047.
• Implement process exit watcher. Closes #1024.
• Upgrade arguable to ^11.0.0-alpha.0.
• Upgrade prospective to ^0.1.0-alpha.1. See #1038.
• Caret pin reconfigure-3.0.0-alpha.1. See #1038.
• Upgrade avenue to ^0.2.0-alpha.0. See #1021.
• Build processor in try/catch. See #1027.
• Move the watcher into its own module. See #1021.
• Isolate JSON parsing into a try/catch block. See #1013.
• Create a directory watcher. Closes #1013.
• Implement temporary directory generator. Closes #1012.
• Add some Docco.

Closes #1072.