Add a material that makes use of being ignited by lava

[Andromander]

It's starting to become clear to me that everything I add in Ornamental doesn't get ignited by lava, yet my addons manage to do this, and it annoys me. I mean, Hay Blocks don't get ignited by lava, why is this even happening in the first place? It's a bundled of dried grass that processes into bread.

Upon further research into a possible candidate to make this worth an update for Ornamental, the TNT block can be ignited by lava and is a good enough block to be converted. This would, however, require adding TNT entities for each block, which would end up being unsustainable.

Alternatively, next update, just add this property in since it's widely used outside of Ornamental.