win32 gui: replace D2D renderer with D3d11 shader

src/win32/xy.zig

@@ -0,0 +1,14 @@
+pub fn XY(comptime T: type) type {
+    return struct {
+        x: T,
+        y: T,
+        pub fn init(x: T, y: T) @This() {
+            return .{ .x = x, .y = y };
+        }
+
+        const Self = @This();
+        pub fn eql(self: Self, other: Self) bool {
+            return self.x == other.x and self.y == other.y;
+        }
+    };
+}