www/rtv: Update to 1.17.0

Features

• Added the J command to jump to the next sibling comment.
• Added the K command to jump to the parent comment.
• Search results can now be sorted, and the title bar has been updated to display the current search query.
• Imgur URLs are now resolved via the Imgur API. This enables the loading of large albums with over 10 images. An imgur_client_id option has been added to the RTV configuration.
• A MIME parser has been added for www.liveleak.com.
• RTV now respects the $VISUAL environment variable.

Bugfixes

• Fixed a screen refresh bug on urxvt terminals.
• New key bindings will now attempt to fallback to their default key if not defined in the user's configuration file.

Documentation

• Added additional mailcap examples for framebuffer videos and iTerm2.
• Python version information is now captured in the log at startup.