Update loot table schemas (#391)

* update loot table schemas

* remove entity_properties and use new int_or_range definition

* remove entity_properties from conditions.json as well

source/general/int_or_range.json

@@ -0,0 +1,16 @@
+{
+  "$id": "Integer or Range",
+  "description": "An integer value or inclusive range.",
+  "oneOf": [
+    { "type": "integer" },
+    {
+      "type": "object",
+      "additionalProperties": false,
+      "required": ["min", "max"],
+      "properties": {
+        "min": { "type": "integer", "description": "Minimum value." },
+        "max": { "type": "integer", "description": "Maximum value." }
+      }
+    }
+  ]
+}