Moved to a Clean Architecture system.

- Replaced `GameViewModel` with `GameState`.
- Added an Interactor for moving pieces.
- Added an `AppState` Observable.
- Cleaned up commented code.

MoreChess.xcodeproj/project.pbxproj

@@ -7,16 +7,14 @@
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@@ -49,11 +54,10 @@
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-		B94B61B52B55476400C998F3 /* GameViewModel.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = GameViewModel.swift; sourceTree = "<group>"; };
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+		B9ABF7A62BAEF11E00907C61 /* AppState.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppState.swift; sourceTree = "<group>"; };
+		B9ABF7A82BAEF18A00907C61 /* GameState.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = GameState.swift; sourceTree = "<group>"; };
+		B9ABF7AA2BAEF1EB00907C61 /* BoardView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BoardView.swift; sourceTree = "<group>"; };
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+		B9FAC9142BAEF6C3002A20F7 /* PositioningInteractor.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PositioningInteractor.swift; sourceTree = "<group>"; };
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@@ -115,15 +126,15 @@
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 			isa = PBXGroup;
 			children = (
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+				B9ABF7A42BAEF04C00907C61 /* DataAccess */,
+				B9ABF7A52BAEF0C500907C61 /* Models */,
 				B95CE50F2AD4CB5B00978591 /* MoreChessApp.swift */,
-				B95CE5102AD4CB5B00978591 /* ContentView.swift */,
-				B94B61AF2B461D3200C998F3 /* Piece.swift */,
-				B94B61B22B461DD200C998F3 /* GridPosition.swift */,
-				B94B61B52B55476400C998F3 /* GameViewModel.swift */,
+				B94B61B22B461DD200C998F3 /* GridCoordinate.swift */,
 				B94B61F42B68F8D700C998F3 /* PieceGenerator.swift */,
-				B90F55A82BA61F6E00874F00 /* MoviesView.swift */,
 				B95CE5112AD4CB5E00978591 /* Assets.xcassets */,
-				B90F55AB2BA6289800874F00 /* PieceView.swift */,
+				B9FAC9182BAF070C002A20F7 /* Launch Screen.storyboard */,
 			);
 			path = Shared;
 			sourceTree = "<group>";
@@ -165,6 +176,60 @@
 			path = "Tests macOS";
 			sourceTree = "<group>";
 		};
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+				B95CE5102AD4CB5B00978591 /* ContentView.swift */,
+				B9ABF7AA2BAEF1EB00907C61 /* BoardView.swift */,
+				B90F55AB2BA6289800874F00 /* PieceView.swift */,
+				B90F55A82BA61F6E00874F00 /* MovesView.swift */,
+			);
+			path = Presentation;
+			sourceTree = "<group>";
+		};
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+			isa = PBXGroup;
+			children = (
+				B9FAC9122BAEF69F002A20F7 /* Interactors */,
+				B9FAC9132BAEF6A5002A20F7 /* State */,
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+			);
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+			children = (
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+			children = (
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+				B9ABF7A82BAEF18A00907C61 /* GameState.swift */,
+				B9FAC9102BAEF492002A20F7 /* PositioningState.swift */,
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+			);
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 				B95CE53B2AD4CB5E00978591 /* Assets.xcassets in Resources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
@@ -323,29 +389,33 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
-				B94B61B32B461DD200C998F3 /* GridPosition.swift in Sources */,
+				B9ABF7AB2BAEF1EB00907C61 /* BoardView.swift in Sources */,
+				B9FAC9172BAEFFAC002A20F7 /* LayoutState.swift in Sources */,
+				B9FAC9112BAEF492002A20F7 /* PositioningState.swift in Sources */,
+				B94B61B32B461DD200C998F3 /* GridCoordinate.swift in Sources */,
 				B95CE5392AD4CB5E00978591 /* ContentView.swift in Sources */,
 				B95CE5372AD4CB5E00978591 /* MoreChessApp.swift in Sources */,
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 				B94B61B02B461D3200C998F3 /* Piece.swift in Sources */,
-				B90F55A92BA61F6E00874F00 /* MoviesView.swift in Sources */,
+				B90F55A92BA61F6E00874F00 /* MovesView.swift in Sources */,
+				B9ABF7A92BAEF18A00907C61 /* GameState.swift in Sources */,
 				B94B61F52B68F8D700C998F3 /* PieceGenerator.swift in Sources */,
-				B94B61B62B55476400C998F3 /* GameViewModel.swift in Sources */,
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 				B94B61B12B461D3200C998F3 /* Piece.swift in Sources */,
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@@ -507,6 +577,7 @@
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 				INFOPLIST_KEY_UIApplicationSupportsIndirectInputEvents = YES;
 				INFOPLIST_KEY_UILaunchScreen_Generation = YES;
+				INFOPLIST_KEY_UILaunchStoryboardName = "Launch Screen.storyboard";
 				INFOPLIST_KEY_UISupportedInterfaceOrientations_iPad = "UIInterfaceOrientationPortrait UIInterfaceOrientationPortraitUpsideDown UIInterfaceOrientationLandscapeLeft UIInterfaceOrientationLandscapeRight";
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@@ -537,6 +608,7 @@
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 				INFOPLIST_KEY_UIApplicationSupportsIndirectInputEvents = YES;
 				INFOPLIST_KEY_UILaunchScreen_Generation = YES;
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 				INFOPLIST_KEY_UISupportedInterfaceOrientations_iPad = "UIInterfaceOrientationPortrait UIInterfaceOrientationPortraitUpsideDown UIInterfaceOrientationLandscapeLeft UIInterfaceOrientationLandscapeRight";
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