add buildValidSubstitutes setting to builder

src/api/java/baritone/api/Settings.java

@@ -215,6 +215,13 @@ public final class Settings {
 
     )));
 
+    /**
+     * A mapping of blocks to blocks treated as correct in their position
+     * <p>
+     * If a schematic asks for a block on this mapping, all blocks on the mapped list will be accepted at that location as well
+     */
+    public final Setting<Map<Block, List<Block>>> buildValidSubstitutes = new Setting<>(new HashMap<>());
+
     /**
      * A list of blocks to become air
      * <p>

src/main/java/baritone/process/BuilderProcess.java

@@ -797,6 +797,9 @@ public final class BuilderProcess extends BaritoneProcessHelper implements IBuil
         if (Baritone.settings().buildSkipBlocks.value.contains(desired.getBlock()) && !itemVerify) {
             return true;
         }
+        if (Baritone.settings().buildValidSubstitutes.value.getOrDefault(desired.getBlock(), Arrays.asList()).contains(current.getBlock()) && !itemVerify) {
+            return true;
+        }
         return current.equals(desired);
     }