Improved application structure

tests/custom/database/src/main_simplified.py

@@ -0,0 +1,15 @@
+from application import Application
+from cpl.application import ApplicationBuilder
+from cpl.core.console import Console
+from startup import Startup
+
+
+def main():
+    builder = ApplicationBuilder(Application).use_startup(Startup)
+    app = builder.build()
+    app.run()
+    Console.write_line("Hello from main_simplified.py!")
+
+
+if __name__ == "__main__":
+    main()