textures: add cut copper slabs

Also fix copper stairs stuff not being in alt_height.

overviewer_core/src/block_class.c

@@ -315,7 +315,23 @@ const mc_block_t block_class_alt_height[] = {
     block_stone_slab2,
     block_purpur_stairs,
     block_purpur_slab,
-    block_wooden_slab};
+    block_wooden_slab,
+    block_cut_copper_stairs,
+    block_exposed_cut_copper_stairs,
+    block_weathered_cut_copper_stairs,
+    block_oxidized_cut_copper_stairs,
+    block_waxed_cut_copper_stairs,
+    block_waxed_exposed_cut_copper_stairs,
+    block_waxed_weathered_cut_copper_stairs,
+    block_waxed_oxidized_cut_copper_stairs,
+    block_cut_copper_slab,
+    block_exposed_cut_copper_slab,
+    block_weathered_cut_copper_slab,
+    block_oxidized_cut_copper_slab,
+    block_waxed_cut_copper_slab,
+    block_waxed_exposed_cut_copper_slab,
+    block_waxed_weathered_cut_copper_slab,
+    block_waxed_oxidized_cut_copper_slab};
 const size_t block_class_alt_height_len = COUNT_OF(block_class_alt_height);
 
 const mc_block_t block_class_nether_roof[] = {

overviewer_core/src/mc_id.h

@@ -348,6 +348,16 @@ enum mc_block_id {
     block_waxed_weathered_cut_copper_stairs = 1070,
     block_waxed_oxidized_cut_copper_stairs = 1071,
 
+    block_cut_copper_slab = 1072,
+    block_exposed_cut_copper_slab = 1073,
+    block_weathered_cut_copper_slab = 1074,
+    block_oxidized_cut_copper_slab = 1075,
+
+    block_waxed_cut_copper_slab = 1076,
+    block_waxed_exposed_cut_copper_slab = 1077,
+    block_waxed_weathered_cut_copper_slab = 1078,
+    block_waxed_oxidized_cut_copper_slab = 1079,
+
     // adding a gap in the numbering of walls to keep them all
     // in one numbering block starting at 1792
     // all blocks between 1792 and 2047 are considered walls

overviewer_core/src/overviewer.h

@@ -31,7 +31,7 @@
 
 // increment this value if you've made a change to the c extension
 // and want to force users to rebuild
-#define OVERVIEWER_EXTENSION_VERSION 103
+#define OVERVIEWER_EXTENSION_VERSION 104
 
 #include <stdbool.h>
 #include <stdint.h>