implement paper upgrades 4 and 6

src/data/layers/coal.tsx

@@ -802,6 +802,11 @@ const layer = createLayer(id, function (this: BaseLayer) {
             exponent: 1.1,
             description: "Snowball Level 2",
             enabled: management.elfTraining.kilnElfTraining.milestones[1].earned
+        })),
+        createAdditiveModifier(() => ({
+            addend(){return paper.paper.value},
+            description: "Paper Burning",
+            enabled: paper.ashUpgrade.bought
         }))
     ]);
     const computedAshGain = computed(() => ashGain.apply(0));

src/data/layers/management.tsx

@@ -1377,7 +1377,7 @@ const layer = createLayer(id, () => {
     });
 
     const classroomEffect = computed(() => {
-        return Decimal.add(classrooms.amount.value, 1).pow(0.9);
+        return Decimal.add(classrooms.amount.value, 1).pow(0.9).pow(paper.classroomUpgrade.bought.value ? 1.1 : 1);
     });
 
     const classrooms = createBuyable(() => ({

src/data/layers/paper.tsx

@@ -299,7 +299,7 @@ const layer = createLayer(id, function (this: BaseLayer) {
         cost: 1e36,
         visibility: () => showIf(management.elfTraining.heavyDrillElfTraining.milestones[4].earned.value),
         display: {
-            title: "Paper burning",
+            title: "Paper Burning",
             description: "Paper adds to ash gain after all other modifiers"
         }
     }));