Dependency updates and addition of reset order before the start of the new order

[bekzad]

1. Updated Kotlin, Gradle and AGP.
2. Target and Compile versions updated.
3. Updated all dependencies (Changed Transformations.map to new Livedata.map method).
4. Removed warning - "OnCreateView always returns non-null".
5. Added viewModel.resetOrder() to StartFragment, if the user navigates back to it and starts the order again, user will see clean order.

[berila7]

what is the difference between Transformations.map and _price.map