Replaces platform-specific APIs across 21 files with std::chrono, std::fstream, std::filesystem, and std::this_thread. Adds PlatformTime.h utility header wrapping std::chrono::steady_clock for GetTickCount/QueryPerformanceCounter patterns.
Inlined trivial wrappers, moved ranged random methods to Random, replaced M_PI with std::numbers::pi, unified DEGRAD/RAD_TO_GRAD as DEG_TO_RAD, fixed getInt/getDouble default fallback bug, and switched non-worldgen sin/cos to sinf/cosf.