Remove version numbers in packages/ directory
Clean up copyright notices.
* packages/uni-confusables/uni-confusables.el: Add ELPA metadata.
* packages/uni-confusables/uni-confusables-pkg.el: Delete.
* packages/uni-confusables/gen-confusables.el: Use cl-lib.
(gen-confusables-write): Generate a file header that better complies with
the coding conventions (and includes the ELPA metadata).
* packages/uni-confusables/uni-confusables.el: Fix up comment convention.
* packages/uni-confusables/gen-confusables.el (gen-confusables-write): Idem.