check gobang's issue

[kyoto7250]

Review the list of issues to pick out areas that may need fixing.
https://github.com/TaKO8Ki/gobang/issues

• enhancement
  • TaKO8Ki/gobang#87
  • TaKO8Ki/gobang#83
  • TaKO8Ki/gobang#92
  • TaKO8Ki/gobang#170
  • TaKO8Ki/gobang#138
• Server Support
  • TaKO8Ki/gobang#95
  • TaKO8Ki/gobang#163
  • TaKO8Ki/gobang#184
  • TaKO8Ki/gobang#183
• Bug
  • TaKO8Ki/gobang#119
  • TaKO8Ki/gobang#160
  • TaKO8Ki/gobang#174
  • TaKO8Ki/gobang#175
  • TaKO8Ki/gobang#181
  • TaKO8Ki/gobang#182
• Backend
  • TaKO8Ki/gobang#140