同人システムの千幻抄を追加

[h-mikisato]

https://wikiwiki.jp/sengensyou/

ダイスコマンドとしてクリティカル・ファンブルのある3D6の命中・回避判定のみ実装しました https://discord.com/channels/597133335243784192/597133335243784194/978981650362937365

[codecov[bot]]

Codecov Report

Merging #549 (23da11f) into master (84300e5) will increase coverage by 0.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #549      +/-   ##
==========================================
+ Coverage   95.60%   95.61%   +0.01%     
==========================================
  Files         325      327       +2     
  Lines       19031    19075      +44     
==========================================
+ Hits        18195    18239      +44     
  Misses        836      836              

Impacted Files	Coverage Δ
lib/bcdice/game_system.rb	100.00% <100.00%> (ø)
lib/bcdice/game_system/Sengensyou.rb	100.00% <100.00%> (ø)
lib/bcdice/game_system/GhostLive.rb	100.00% <0.00%> (ø)

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[ViVi-shark]

👍

[ysakasin]

@h-mikisato PRありがとうございます！ マージしました

@ViVi-shark 細かい作法のレビューありがとうございます。