0.20.0

Release notes

This release adds support for encoding DBN within the C++ client.
It also improves historical symbology support with the new TsSymbolMap class that
handles mapping historical records to a text symbol. To support this class, several types
for date fields were changed from strings or ints to date::year_month_day.

Enhancements

• Added TsSymbolMap to support historical symbology where mappings change between days
• Added DbnEncoder class for encoding DBN data
• Added blocking API similar to LiveBlocking to DbnFileStore with new GetMetadata
  and NextRecord methods
• Added BboMsg record struct for future bbo-1m and bbo-1s schemas
• Added PitSymbol map constructor from Metadata and a date::year_month_day
• Added Metadata::CreateSymbolMap and Metadata::CreateSymbolMapForDate methods for
  creating symbology maps from historical metadata
• Added blocking API similar to LiveBlocking to DbnFileStore
• Added SymbologyResolution::CreateSymbolMap method for creating a symbology map from
  a symbology resolution response
• Added InFileStream and OutFileStream helper classes for reading and writing binary
  output respectively

Breaking changes

• Added new dependency on Howard Hinnant's date library
• Added ILogReceiver* parameter to all DbnDecoder constructors and one DbnFileStore constructor
• Removed type StrMappingInterval. MappingInterval is now also used in SymbologyResolution.
• Changed Bbo1sMsg and Bbo1mMsg to be aliases for BboMsg
• Changed type of start_date and end_date in MappingInterval to date::year_month_day
• Added stype_in and stype_out fields to SymbologyResolution to support creating
  a TsSymbolMap