Integrate Free Quests system CPP and refactor quest handling #3732
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Description
Introduces a new Free Quests system with C++ backend integration, replacing the previous Lua-based implementation. Adds game_freequests.cpp/hpp, updates player login logic to apply free quests, and exposes Game.addFreeQuestData to Lua. Refactors quest data loading and validation, improves date/time formatting functions, and updates .gitignore and build configuration. Also fixes time formatting in database backup and tools.cpp to use chrono time points.