Update overlay code to compile with iced master

[brianch]

Update to make things compile again after this iced change.

I'm unfamiliar with how to create widgets in iced, to be honest I changed things following a bit blindly iced's official widgets changes, so please be skeptical of this PR 😅 The widgets appear to be working correctly and the changes are almost all trivial, but I'm still not 100% sure if it doesn't introduce problems in the modal position for example.

[genusistimelord]

have you run all of the examples to ensure they all run?

also what was the model p[position issues? I already know they are not perfectly centered since the last changes atm just dont know how to go about getting the correct yet.

[brianch]

Yes, the examples work (the grid needs an additional change, the checkbox message is now set on the "on_toggle" function, and there's a panic related to glyphon while setting the horizontal alignment to center or right, but seems unrelated).

I mentioned the modal because the position isn't being explicitly set anymore, so I don't know if this will cause issues.

[genusistimelord]

could you fix the clippy and formating issue. I can then merge it and take over any needed changes to fix any issues.