[ShinobiGami] 行為判定コマンド

[ysakasin]

スペシャル値とファンブル値を変更可能な行為判定コマンドを追加する

Ref. #302

・行為判定 SG@s#f>=x
　2D6の行為判定を行う
　s: スペシャル値 (省略時 12)
　f: ファンブル値 (省略時 2)
　x: 目標値 (省略可)
　例）SG, SG@11, SG@11#3, SG#3>=7

[codecov]

Codecov Report

Merging #347 (4591ce9) into master (a7edf02) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #347   +/-   ##
=======================================
  Coverage   94.43%   94.44%           
=======================================
  Files         263      263           
  Lines       18055    18077   +22     
=======================================
+ Hits        17050    17072   +22     
  Misses       1005     1005           

Impacted Files	Coverage Δ
lib/bcdice/game_system/ShinobiGami.rb	100.00% <100.00%> (ø)

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