* Replaces AppendVPrintf with fmt::sprintf
* fmt::ArgList now used as a type safe alternative to varargs.
* Removed SIZE_T_FMT compatibility macros. fmt::sprintf is fully portable and supports %zu.
* Adds FLOG functions to log with fmt's native formatting style.
* Uses vanilla logic to decide which blocks rain falls through.
* Rain falls infinitely above the world, and stops at y=0.
* Entities will now be extinguished if they are under rain-blocking
blocks, and fire will now be extinguished by rain similarly.
* Create IsWeatherWetAtXYZ to identify wetness at a particular location.
* Use new code for enderman rain detection.
* Fixes issue #916
* Disable warnings for global constructors in the fire simulator.