• Add new method ->type_all_string (#156 by Pali).
  When type_all_string is set then encode method produce stable deterministic
  string types in result JSON.
  This can be an alternative to Cpanel::JSON::XS::Type when having
  deterministic output is required but string JSON types are enough for any
  output.
  
• Move SvGETMAGIC() from encode_av() and encode_hv() to encode_sv()
  (#156 by Pali)
  
• Add Math::BigInt and Math::BigFloat as recommended dependences
  (#157 by Pali and Grinnz)