Change project structure for cross build

src/desktop/main.odin

@@ -0,0 +1,19 @@
+#+build !wasm32, !wasm64p32
+
+package main
+
+import game ".."
+import "core:os"
+import "core:path/filepath"
+
+main :: proc() {
+	exe_path := os.args[0]
+	exe_dir := filepath.dir(string(exe_path))
+	os.set_working_directory(exe_dir)
+
+	game.init()
+	for game.should_run() {
+		game.update()
+	}
+	game.shutdown()
+}