Remnant/Resource Pack: Add a custom texture to use for the icons of the basic, intermediate, advanced exp recipes

Right now the EXP tab of the recipe book looks like pic related.

It's a little hard to parse. MOP lets you change what the recipe looks like in the recipe book without having to change the recipe's result. So each of the exp recipes could have their own icon, which would make them visually distinct from the exp bottle to emerald recipes.