Add SC_Response_Ex

[nanasess]

refs #684 (comment)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 50.05%. Comparing base (522048a) to head (a1ad737).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1147   +/-   ##
=======================================
  Coverage   50.05%   50.05%           
=======================================
  Files          82       82           
  Lines       10580    10580           
=======================================
  Hits         5296     5296           
  Misses       5284     5284           

Flag	Coverage Δ
tests	50.05% <ø> (ø)

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[seasoftjapan]

require_once DATA_REALDIR.'class_extends/SC_Response_Ex.php'; で発生した例外が回避釣れることを確認した。
require_once DATA_REALDIR.'class_extends/SC_Response_Ex.php'; の有無に関わらず動作することを確認した。