Move solution and projects to src

src/Ryujinx.HLE/Ui/ThemeColor.cs

@@ -0,0 +1,18 @@
+namespace Ryujinx.HLE.Ui
+{
+    public readonly struct ThemeColor
+    {
+        public float A { get; }
+        public float R { get; }
+        public float G { get; }
+        public float B { get; }
+
+        public ThemeColor(float a, float r, float g, float b)
+        {
+            A = a;
+            R = r;
+            G = g;
+            B = b;
+        }
+    }
+}