v4.25.5p2

• #176 Make Sisimai::Message faster
  • Use the negative look-ahead regular expression code to convert all of the email header strings into key-value pairs as a HASH at newly implemented method Sisiai::Message.makemap #175. Thanks to @xtetsuji
  • Remove Sisimai::Message.takeapart (replaced with makemap)
  • Remove Sisimai::Message.headers (replaced with makemap)
  • Code improvement for require statement before method calls #177
• Make Sisimai::Order faster
  • Rewrite Sisimai::Order.make
  • Remove Sisimai::Order.by
  • Remove Sisimai::Order.headers
  • Remove Sisimai::Lhost.headerlist
  • And all headerlist method have been removed from Sisimai::Lhost::*, Sisimai::RFC3834 and Sisimai::ARF
  • The MTA module to be loaded at first is decided by the first 2 words of each bounce mail subject, is defined at Subject in Sisimai::Order
  • Some variables are replaced with state
• Code improvement for require statement before calling match() method of some modules defined in $PreMatches at Sisimai::Reason::UserUnknown
• Remove the following unused methods:
  • Sisimai::MIME.patterns
  • Sisimai::SMTP.command