Fix MgStoneType and BiomeType enum names

src/mg_biome.h

@@ -33,13 +33,13 @@ class BiomeManager;
 
 #define BIOME_NONE ((u8)0)
 
-enum BiomeType
-{
-	BIOME_NORMAL,
-	BIOME_LIQUID,
-	BIOME_NETHER,
-	BIOME_AETHER,
-	BIOME_FLAT
+// TODO(hmmmm): Decide whether this is obsolete or will be used in the future
+enum BiomeType {
+	BIOMETYPE_NORMAL,
+	BIOMETYPE_LIQUID,
+	BIOMETYPE_NETHER,
+	BIOMETYPE_AETHER,
+	BIOMETYPE_FLAT,
 };
 
 class Biome : public ObjDef, public NodeResolver {