Trim whitespace from URLs

[Miciah]

• org-cliplink.el (org-cliplink-clipboard-content): Trim the string.

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I assume there is no need to make this configurable since a URL cannot contain whitespace.

I'm ambivalent about whether trimming should be done by org-cliplink-clipboard-content, by org-cliplink-org-mode-link-transformer, or possibly by org-cliplink and org-cliplink-capture. What do you think?

[rexim]

1. org-cliplink-org-mode-link-transformer is done after performing the HTTP request, so if the URL contains any spaces org-cliplink tries to query URL with spaces anyway.
2. org-cliplink-clipboard-content works well, but trimming whitespaces kinda contradicts the name of the function. But since we already modifying the content with substring-no-property maybe it's ok.

I'll merge it. Thanks for the contribution!