Add hooks to make it easier to add custom TNT blocks (#6290)

src/main/java/net/minecraftforge/common/extensions/IForgeBlock.java

@@ -923,6 +923,17 @@ public interface IForgeBlock
         return state.getFlammability(world, pos, face) > 0;
     }
 
+    /**
+     * If the block is flammable, this is called when it gets lit on fire.
+     *
+     * @param state The current state
+     * @param world The current world
+     * @param pos Block position in world
+     * @param face The face that the fire is coming from
+     * @param igniter The entity that lit the fire
+     */
+    default void catchFire(BlockState state, World world, BlockPos pos, @Nullable Direction face, @Nullable LivingEntity igniter) {}
+
     /**
      * Called when fire is updating on a neighbor block.
      * The higher the number returned, the faster fire will spread around this block.

src/main/java/net/minecraftforge/common/extensions/IForgeBlockState.java

@@ -771,6 +771,19 @@ public interface IForgeBlockState
         return getBlockState().getBlock().isFlammable(getBlockState(), world, pos, face);
     }
 
+    /**
+     * If the block is flammable, this is called when it gets lit on fire.
+     *
+     * @param world The current world
+     * @param pos Block position in world
+     * @param face The face that the fire is coming from
+     * @param igniter The entity that lit the fire
+     */
+    default void catchFire(World world, BlockPos pos, @Nullable Direction face, @Nullable LivingEntity igniter)
+    {
+        getBlockState().getBlock().catchFire(getBlockState(), world, pos, face, igniter);
+    }
+
     /**
      * Called when fire is updating on a neighbor block.
      * The higher the number returned, the faster fire will spread around this block.