remove all warnings and remove deprecated widgets and properties

[Munsif-Ali]

I removed all the warning which are caused either by using the old widgets or properties check out it if you liked it please merge it its my first contribution i want to contribute in the projects its my beginning so its obvious that i may have made mistakes in it so if you can please point out i would be very happy to work on it. I liked you UI so much if you want me to contribute in your other projects then let me know i have worked on Three big projects in flutter.