Convert "rate" variable to float everywhere
This follows the historical LibVLC semantic (and new --rate one), so bigger is faster. In the process, simplify a few code paths, especially those in LibVLC, but make many other code paths more complicated due to integer<->float conversion. Most of those paths could probably be simplified. * Fix RC "fastforward" command behaviour (it was slowing down instead) * Fix str_format_mera 'R' format string with negative rates and rates such that (rate % 1000 < 100).
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