HTTP Downloads: Fix progress and remaining time for downloads without size

When the HTTP server does not specify content-length, VLC showed strange values.
In this case, we show an activity indicator instead of progress.

added 7 commits

• af89dc4c...e27f99b0 - 6 commits from branch videolan:master
• 287fceca - HTTP Downloads: Fix progress and remaining time for downloads without size

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added 7 commits

• 287fceca...53bcbd81 - 6 commits from branch videolan:master
• 9f03c77e - HTTP Downloads: Fix progress and remaining time for downloads without size

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changed milestone to %3.2.7

added 1 commit

• 5f7f4151 - HTTP Downloads: Fix progress and remaining time for downloads without size

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added 2 commits

• 47110491 - 1 commit from branch videolan:master
• ac6af1d4 - HTTP Downloads: Fix progress and remaining time for downloads without size

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merged