[emacs-w3m:13577] [emacs-w3m/emacs-w3m] Improve perldoc with customizable variable, and saner default. (#72)

Currently the `w3m-perldoc` command has the base URL `about://perldoc/` hardcoded into the function call. I added a `defcustom`, changed the default to `https://perldoc.perl.org/`, and added a function that attempts to cleanup user input in a way more likely to match a page.

Try running:
`(w3m-perldoc "Pod Checker")`
which will send you off to https://perldoc.perl.org/Pod/Checker.html#NAME

TODO:
- Improve the cleanup to deal with other things (like case), and query the user when the input lead to a 404 page.
You can view, comment on, or merge this pull request online at:

  https://github.com/emacs-w3m/emacs-w3m/pull/72

-- Commit Summary --

  * Improve perldoc with customizable variable, and saner default.

-- File Changes --

    M w3m-perldoc.el (25)
    M w3m-util.el (6)

-- Patch Links --

https://github.com/emacs-w3m/emacs-w3m/pull/72.patch
https://github.com/emacs-w3m/emacs-w3m/pull/72.diff

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