Address info-like macros with a width parameter

We've seen info macros with a width parameter. This width parameter is not used by Confluence at render time from what we have seen: it doesn't seem to have any effect. We don't know why it's there.

The issue is that these macros are currently transferred as-is (we don't have any macro converter for them), and XWiki's info macro does support a width parameter. This leads to a situation where the info macro takes all the space in Confluence and is smaller in XWiki.

We should probably:

1. Make sure the width parameter is indeed unused. Knowing how it can end up there would be a plus.
2. Add macro converters that just pass the title and the content. The width parameter will be marked as unhandled and not transferred.