Implement part of GSAutoLayoutEngine dependency management logic (#178)

* Implement part of GSAutoLayoutEngine dependency management logic

* Fix formatting of GSAutoLayoutEngine, GSCSFloatComparator and GSCSSolution

* Address PR feedback

* Address PR feedback

* Replace assignment with ASSIGN macro and fix makefile

* Add back dealloc in GSAutoLayoutEngine.m and GSCSSolution.m

Source/GSCSSolution.h

@@ -0,0 +1,44 @@
+/* Copyright (C) 2023 Free Software Foundation, Inc.
+   
+   By: Benjamin Johnson
+   Date: 19-3-2023
+   This file is part of the GNUstep Library.
+   
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+   
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+   
+   You should have received a copy of the GNU Lesser General Public
+   License along with this library; if not, write to the Free
+   Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+   Boston, MA 02110 USA.
+*/
+
+#import <Foundation/Foundation.h>
+#import "GSCSVariable.h"
+
+#ifndef _GS_CS_Solution_H
+#define _GS_CS_Solution_H
+
+@interface GSCSSolution : NSObject
+{
+   NSMapTable *_resultsByVariable;
+}
+
+- (void) setResult: (CGFloat)result forVariable: (GSCSVariable*)variable;
+
+- (NSNumber*) resultForVariable: (GSCSVariable*)variable;
+
+- (NSArray*) variables;
+
+- (BOOL) isEqualToCassowarySolverSolution: (GSCSSolution*)solution;
+
+@end
+
+#endif