Prolific v27.0.0-alpha.4

• Processors are now full CommonJS modules. See #1004. See #1003.
• Log processing error. Closes #1134.
• Create processors using contextualized require. See #1003.
• Remove Descendant dependency. Closes #1061.
• Remove unused p-queue dependency. Closes #1137.
• Add an end-of-stream entry. Closes #1135.

Closes #1159.