Revert "Modify the POD of the module (guessing from the original unit test, the module doesn't leave the <!-- comment text --> but removes it as well)"

This reverts commit 457ae9913b4048ea1d191c01f5d80bfd96fd9b51.
* Instead of removing <!-- contents of HTML comments --> altogether, make multiline comments single-line and replace "[<>]" characters with "|"
* Rename regexp callback subroutines to better explain what they're doing
* Remove precompiled regular expressions (didn't add any speed and weren't that reusable)
Version bump, changelog