4x Calcined Flint

<p>This patch increases the yield of calcined flint, making each unit of flint produce 4 calcined flint instead of just 1. While I appreciate the overall changes to fire clay, I found that the fuel consumption for this process felt disproportionately high compared to others. To balance this, the mod simply boosts the amount of calcined flint obtained per flint, making the process more efficient.</p>