improve rain simulation (#4017)

* 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.

src/World.cpp

@@ -542,6 +542,34 @@ void cWorld::ChangeWeather(void)
 
 
 
+bool cWorld::IsWeatherWetAtXYZ(Vector3i a_Pos)
+{
+	if ((a_Pos.y < 0) || !IsWeatherWetAt(a_Pos.x, a_Pos.z))
+	{
+		return false;
+	}
+
+	if (a_Pos.y >= cChunkDef::Height)
+	{
+		return true;
+	}
+
+	for (int y = GetHeight(a_Pos.x, a_Pos.z); y >= a_Pos.y; y--)
+	{
+		auto BlockType = GetBlock({a_Pos.x, y, a_Pos.z});
+		if (cBlockInfo::IsRainBlocker(BlockType))
+		{
+			return false;
+		}
+	}
+
+	return true;
+}
+
+
+
+
+
 void cWorld::SetNextBlockTick(int a_BlockX, int a_BlockY, int a_BlockZ)
 {
 	return m_ChunkMap->SetNextBlockTick(a_BlockX, a_BlockY, a_BlockZ);