(a)For Claimant. A party seeking to recover upon a claim, counterclaim, or cross-claim or to obtain a declaratory judgment may, at any time after the adverse party has appeared or answered, move with or without supporting affidavits for a summary judgment in his favor upon all or any part thereof. A summary judgment, interlocutory in character, may be rendered on the issue of liability alone although there is a genuine issue as to amount of damages. (b)For Defending Party. A party against whom a