Added the ability to mix decimated and non-decimated content files in the same odid resource

ODIDDateSource.preroll() now uses the presence of the framerate parameter
 in a content info file to determine whether the content is decimated or
 non-decimated. With this system, and odid resource can now have a combination
 of decimated/non-decimated stream types.

Tested with odid resource with and without content info "framerate" values
 and verified FrameRateInTrickMode was/wasn't present when expected.