Implemented new Tranquility value API

For quick compat, mods can now register a static state-based tranquility
value for their blocks. More

src/main/java/WayofTime/bloodmagic/incense/IIncensePath.java

@@ -0,0 +1,14 @@
+package WayofTime.bloodmagic.incense;
+
+import net.minecraft.block.state.IBlockState;
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.world.World;
+
+public interface IIncensePath {
+    /**
+     * Goes from 0 to however far this path block can be from the altar while
+     * still functioning. 0 represents a block that can work when it is two
+     * blocks horizontally away from the altar.
+     */
+    int getLevelOfPath(World world, BlockPos pos, IBlockState state);
+}