Adding Emeralds to generation (#4817)

* Adding Emeralds to generation

* fixed crash

* fixed documentation and changed function name to match others

* forgot to change the name in the doc

* removed debug output - sorry build servers

Co-authored-by: 12xx12 <12xx12100@gmail.com>

Server/Plugins/APIDump/APIDesc.lua

@@ -13630,6 +13630,23 @@ end
 					},
 					Notes = "Returns true if the biome is very cold (has snow on ground everywhere, turns top water to ice, has snowfall instead of rain everywhere). Doesn't report mildly cold biomes (where it snows above certain elevation), use IsBiomeCold() for those.",
 				},
+				IsBiomeMountain =
+				{
+					Params =
+					{
+						{
+							Name = "Biome",
+							Type = "EMCSBiome",
+						}
+					},
+					Returns =
+					{
+						{
+							Type = "boolean",
+						},
+					},
+					Notes = "Returns if the biome is a mountain type biome. So mutations of the extreme hills biome"
+				},
 				IsValidBlock =
 				{
 					Params =