The Supreme Court shall have appellate jurisdiction for correction of errors of law in law cases, and shall review upon appeal:
(1) Any intermediate judgment, order or decree in a law case involving the merits in actions commenced in the court of common pleas and general sessions, brought there by original process or removed there from any inferior court or jurisdiction, and final judgments in such actions; provided, that if no appeal be taken until final judgment is entered the court may upon appeal from such final judgment review any intermediate order or decree necessarily affecting the judgment not before appealed from;
(2) An order affecting a substantial right made in an action when such order (a) in effect determines the action and prevents a judgment from which an appeal might be taken or discontinues the action, (b) grants or refuses a new trial or (c) strikes out an answer or any part thereof or any pleading in any action;
(3) A final order affecting a substantial right made in any special proceeding or upon a summary application in any action after judgment; and
(4) An interlocutory order or decree in a court of common pleas granting, continuing, modifying, or refusing an injunction or granting, continuing, modifying, or refusing the appointment of a receiver.