Release 0.115.0

New features:

• bson UTC datetime associated with jsoncons semantic_tag_type::timestamp

• New traits class is_json_type_traits_impl that addresses issues
  #133 and
  #115 (duplicates)

• Following a proposal from soberich, jsonpath functions on JSONPath expressions
  are no longer restricted to filter expressions.

• New jsonpath functions sum, count, avg, and prod have been added.

• Added semantic_tag_type::base16, semantic_tag_type::base64, semantic_tag_type::base64url

Non-breaking changes:

• The json constructor that takes a byte_string and a byte_string_chars_format
  has been deprecated, use a semantic_tag_type to supply an encoding hint for a byte string, if any.

• The content handler byte_string_value function that takes a byte_string and a byte_string_chars_format
  has been deprecated, use a semantic_tag_type to supply an encoding hint for a byte string, if any.

Changes:

• The byte_string_chars_format parameter in the content handler do_byte_string_value function
  has been removed, the semantic_tag_type parameter is now used to supply an encoding hint for a byte string, if any.