iOS: Add frontend & frontend build files (#746)

* iOS: Add SwiftUI part to repo

* Add iOS build script

* Update SDL2 submodule

* Fix iOS build script

* CI: Update xcode tools for iOS

* Update iOS_Build.yml

* Update iOS build

* Lower XCode version

* A

* Update project.pbxproj

* Update iOS_Build.yml

* Update iOS_Build.yml

* Update build.sh

src/pandios/Pandios/ContentView.swift

@@ -0,0 +1,51 @@
+import AlberDriver
+import SwiftUI
+import MetalKit
+import Darwin
+
+struct ContentView: UIViewRepresentable {
+    @State var showFileImporter = true
+
+    /*
+    func makeCoordinator() -> Renderer {
+        Renderer(self)
+    }
+    */
+    
+    func makeUIView(context: UIViewRepresentableContext<ContentView>) -> MTKView {
+        let mtkView = MTKView()
+        mtkView.preferredFramesPerSecond = 60
+        mtkView.enableSetNeedsDisplay = true
+        mtkView.isPaused = true
+        
+        if let metalDevice = MTLCreateSystemDefaultDevice() {
+            mtkView.device = metalDevice
+        }
+        
+        mtkView.framebufferOnly = false
+        mtkView.drawableSize = mtkView.frame.size
+
+        let dispatchQueue = DispatchQueue(label: "QueueIdentification", qos: .background)
+        let metalLayer = mtkView.layer as! CAMetalLayer;
+
+        dispatchQueue.async{
+            iosCreateEmulator()
+            
+            while (true) {
+                iosRunFrame(metalLayer);
+            }
+        }
+
+        return mtkView
+    }
+    
+    func updateUIView(_ uiView: MTKView, context: UIViewRepresentableContext<ContentView>) {
+        print("Updating MTKView");
+    }
+}
+
+struct ContentView_Previews: PreviewProvider {
+    static var previews: some View {
+        ContentView()
+    }
+}