PatchExporterの責務をFileとLogに分割

[shinsuke-mat]

resolve (a half part of) #801

やったこと

PatchExporterがコンソール出力とファイル出力の両方を行っていたため #801 の問題が出ていた．
2つの責務を分割した．
あわせてテストも分割した．

ついでにファサードクラス Exporters の受け口周りを少し改善．

[codecov-io]

Codecov Report

Merging #804 (50b3b00) into master (8367788) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #804      +/-   ##
============================================
+ Coverage     80.58%   80.60%   +0.02%     
  Complexity      937      937              
============================================
  Files           151      152       +1     
  Lines          3672     3676       +4     
  Branches        273      274       +1     
============================================
+ Hits           2959     2963       +4     
  Misses          605      605              
  Partials        108      108              

Impacted Files	Coverage Δ	Complexity Δ
...java/jp/kusumotolab/kgenprog/output/Exporters.java	86.20% <100.00%> (ø)	9.00 <3.00> (-2.00)
...kusumotolab/kgenprog/output/PatchFileExporter.java	82.85% <100.00%> (ø)	9.00 <2.00> (?)
.../kusumotolab/kgenprog/output/PatchLogExporter.java	100.00% <100.00%> (ø)	5.00 <5.00> (?)

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[ty-v1]

LGTMです．
マージします