v0.8 final

• When providers bouquet is downloaded (-b or -bd option) now uses full service references
  instead of just the epg relevant part in case it's used for picon naming
• Better multi provider handler e.g. if there is an issue with one provider it
  won't stop the script processing others
• If vod categories are out of order in the playlist group together
• Fix file naming issues with non alphanumeric characters
• Much faster when using an override file :)
• Don't retry failed picon downloads
• Option to add placeholder channel in override file (to control channel numbering)
• Allow channels to be moved between categories, use categoryOverride in the override file
• All custom categories, use customCategory="true" in the override file
• Add provider managed update support