— 📝Fixes#1315, #1374, and #1400.
— 📝 Lifetime in iterators was referencing the wrong stack (the main thread) rather than the coroutine's stack at time of creation.
— 📝 Using main_reference/main_* objects was a suitable enough fix for most of these problems.
— ⚡🛠 Prevent performance and usability issues from changing containers by storing the being/end iterator separately, rather than continually invoking `deferred_uc::end(…)` every time.
— 🛠 Improve sizes for stored iterators in select cases.
— 🛠 Allow for sentinel-style C++20-and-beyond ranges.
— 🔧 Improve single file generation CMake.
— 👷♀️ Fix up internal Lua build system issues.
