Revert "Removed Item.toJson b/c Item.json is serializable"

This reverts commit 79ac336.

api/ECNQueue.py

@@ -52,7 +52,7 @@ def __init__(self, queue: str, number: int) -> None:
 		self.building = self.__getMostRecentHeaderByType("Building")
 		self.dateReceived = self.__getMostRecentHeaderByType("Date")
 
-		self.json = {
+		self.jsonData = {
 			"lastUpdated": self.lastUpdated,
 			"headers": self.headers,
 			"content": self.content,
@@ -260,6 +260,14 @@ def __getAssignedTo(self) -> str:
 		assignedTo = self.__getMostRecentHeaderByType("Assigned-To")
 		return assignedTo
 
+	def toJson(self) -> dict:
+		"""Returns a JSON safe representation of the item.
+
+		Returns:
+			dict: JSON safe representation of the item.
+		"""
+		return json.dumps(self.jsonData)
+
 	def __repr__(self) -> str:
 		return self.queue + str(self.number)