Refactor: Embed global variables and functions into GthulhuPlugin struct#4

ianchen0119 merged 7 commits into

mainGthulhu/plugin:mainfrom

copilot/fix-832e5369-6bb2-4d53-ac19-d254d50df83eGthulhu/plugin:copilot/fix-832e5369-6bb2-4d53-ac19-d254d50df83eCopy head branch name to clipboard