Add Legacy missing items and OP Link Modifier (#90)

src/main/resources/data/rivencraft/loot_table/blocks/link_modifier.json

@@ -0,0 +1,4 @@
+{
+  "type": "minecraft:block",
+  "pools": [{ "rolls": 1, "entries": [{ "type": "minecraft:item", "name": "rivencraft:link_modifier" }] }]
+}

src/main/resources/data/rivencraft/loot_table/chests/mystcraft_library.json

@@ -9,7 +9,7 @@
         { "type": "minecraft:item", "name": "minecraft:leather", "weight": 5,
           "functions": [{ "function": "minecraft:set_count", "count": { "type": "minecraft:uniform", "min": 1, "max": 3 } }] },
         { "type": "minecraft:item", "name": "rivencraft:ink_vial", "weight": 4 },
-        { "type": "minecraft:item", "name": "minecraft:book", "weight": 3 },
+        { "type": "minecraft:item", "name": "rivencraft:sealed_notebook", "weight": 20 },
         { "type": "minecraft:item", "name": "minecraft:experience_bottle", "weight": 1 }
       ]
     },
@@ -17,7 +17,7 @@
       "rolls": { "type": "minecraft:uniform", "min": 1, "max": 2 },
       "entries": [
         { "type": "minecraft:item", "name": "rivencraft:ink_vial", "weight": 3 },
-        { "type": "minecraft:item", "name": "minecraft:book", "weight": 2 },
+        { "type": "minecraft:item", "name": "rivencraft:sealed_notebook", "weight": 2 },
         { "type": "minecraft:item", "name": "minecraft:experience_bottle", "weight": 1 }
       ]
     }