#317 SSA style definition parsing

[Marion DESNAULT]

ffdshow fails to read SSA subtitle style definition correctly when the values separation contains space(s) and not only commas.
It works for the "Format:" line because every spaces on that line are removed with strrmchar(line,L' '); in TsubtitleParserSSA::parse but the same is not and cannot be applied to the "Style:" line.