v2.0.0-alpha.1

• Add support for null keyword in filtering
• Use a single equal operator instead of double equals (breaking change)
• Change SortBy to OrderBy, allow ordering with multiple fields (breaking change)
• Support(asc, desc) keywords per each ordering field instead of IsSortAsc (breaking change)
• Use List instead of HashSet to improve mapper performance internally
• Change infrastructure interfaces
• Add GridifyMapperConfiguration (breaking change)
• Change Paging property names (TotalItems => Count - Items => Data) (breaking change)
• Add support C# 8 Nullable feature