all biome tinting is now handled in rendermode-normal.c.

Note that the case when there isn't any biome data available is not
yet properly handled.

overviewer_core/src/rendermodes.h

@@ -127,9 +127,7 @@ typedef struct {
     /* grasscolor and foliagecolor lookup tables */
     PyObject *grasscolor, *foliagecolor;
     /* biome-compatible grass/leaf textures */
-    PyObject *grass_texture, *leaf_texture, *tall_grass_texture, *tall_fern_texture;
-    /* top facemask for grass biome tinting */
-    PyObject *facemask_top;
+    PyObject *grass_texture;
     
     /* black and white colors for height fading */
     PyObject *black_color, *white_color;