News feed entry type basic definition

News feed entry and header with inheritance of types
FeedType enumeration with generator methods
Unified date parsing method
Dictionary driven variables are now lazy and assigned
RegEx operator as extension
DictionaryFindAny as extension

For each key finds any of given key or returns nil
Rebuild files
Moved news feed parser to another folder.
Corrected error namespace for STNewsFeedParserError
STNewsFeedDiscovery creation

A class that uses RegEx to discover feeds on a given webpage.