Adding SPM support

moved sources into Sources subfolder
added Package.swift file

Author: kenworley

Package.swift

@@ -0,0 +1,31 @@
+// swift-tools-version: 5.6
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "WrapModel",
+    platforms: [
+    	.iOS(.v11)
+    ],
+    products: [
+        // Products define the executables and libraries a package produces, and make them visible to other packages.
+        .library(
+            name: "WrapModel",
+            targets: ["WrapModel"]),
+    ],
+    dependencies: [
+        // Dependencies declare other packages that this package depends on.
+        // .package(url: /* package url */, from: "1.0.0"),
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
+        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        .target(
+            name: "WrapModel",
+            dependencies: []),
+    ],
+    swiftLanguageVersions: [
+    	.v4_2, .v5
+    ]
+)

WrapModel/WrapModel.swift renamed to Sources/WrapModel/WrapModel.swift

@@ -375,7 +375,7 @@ fileprivate extension Dictionary {
 // MARK: AnyWrapProperty protocol
 
 // Protocol which all WrapProperty instances conform to
-public protocol AnyWrapProperty : class {
+public protocol AnyWrapProperty : AnyObject {
     // Key path within the model's data dictionary where this property's value is found
     var keyPath: String {get}
     // The model this property resides in - set by the model itself at initialization

WrapModel/WrapModelLock.swift renamed to Sources/WrapModel/WrapModelLock.swift

@@ -19,7 +19,7 @@ s.source = { :git => "https://github.com/1stdibs/WrapModel.git", :tag => s.versi
 # Dependencies
 # none currently
 
-s.source_files = 'WrapModel/*.{swift}'
+s.source_files = 'Sources/WrapModel/*.{swift}'
 
 end
 

WrapModel.podspec

@@ -112,7 +112,7 @@
 				BEC46B9622384AEF00C0AF1B /* WrapModel.swift */,
 			);
 			name = WrapModel;
-			path = ../WrapModel;
+			path = ../Sources/WrapModel;
 			sourceTree = "<group>";
 		};
 /* End PBXGroup section */