Allow setting qc range with quasiConnectivity setting (#1617)

* add quasiConnectivityRange setting

* make sure qc range respects different world heights

* check if source == null in qc range validator

* merge the two qc settings

* Set minimum range down to zero (no qc)

src/main/java/carpet/helpers/QuasiConnectivity.java

@@ -0,0 +1,24 @@
+package carpet.helpers;
+
+import carpet.CarpetSettings;
+
+import net.minecraft.core.BlockPos;
+import net.minecraft.world.level.Level;
+
+public class QuasiConnectivity {
+
+    public static boolean hasQuasiSignal(Level level, BlockPos pos) {
+        for (int i = 1; i <= CarpetSettings.quasiConnectivity; i++) {
+            BlockPos above = pos.above(i);
+
+            if (level.isOutsideBuildHeight(above)) {
+                break;
+            }
+            if (level.hasNeighborSignal(above)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+}