[Cleanup] remove backslashs not needed.
Change CUtil::SplitParams to support escape name="value" style param.
So we can use this style of param with builtin functions.
Enhanced builtin func SlideShow() support pause and set beginslide path
Merge pull request #2543 from ulion/enhanced_builtin_slideshow

Enhanced builtin func SlideShow() support pause and set beginslide path