VER: Release 0.16.0

[threecgreen]

Enhancements

• Added new publisher values for consolidated DBEQ.MAX
• Added constructor to WithTsOut that updates length to the correct value to account
  for the extra 8 bytes
• Upgrade default cpp-httplib version to 0.14.3 (last to still support OpenSSL 1.1)
• Upgrade default nlohmann_json version to 3.11.3

Breaking changes

• Changed default upgrade_policy to Upgrade so by default the primary record types
  can always be used
• Renamed dummy field in ImbalanceMsg and StatMsg to reserved

Bug fixes

• Fixed handling of ts_out when decoding DBNv1 and upgrading to version 2
• Fixed missing logic to upgrade ErrorMsgV1 and SystemMsgV1 when decoding DBN with
  VersionUpgradePolicy::Upgrade
• Added missing StatType::Vwap variant used in the ICE datasets
• Added missing ToString and operator<< handling for StatType::ClosePrice and
  StatType::NetChange
• Fixed potential for invalid reads when decoding C strings in DbnDecoder

[nmacholl]

LGTM