Edit route

Now that we can view our created routes, and see how they preform turn after turn, now we want to change them!

The edit route dialog is pretty straightforward, as it's a modification on the existing create route dialog. If created with a reference to an existing route, it will preset with that routes details, and saving will then update the existing route.

There's a little bit of work around not allowing the user to change the destination, as they should create a new route instead. And also correctly checking if editing a route is valid. For example, since planes are already allocated to the previously created route, you only need to check if the company has enough planes to increase their allocation.