Custom tone sequence input

I think having the ability to set up a custom beep sequence is nice (originally done by kxradar). I have implemented it for the tilehunting extension, so it would be easy to reuse it for the reminder extension.

![Image](https://github.com/user-attachments/assets/012a7a0c-4e75-46e6-a198-34174f55e109)

https://github.com/timklge/karoo-tilehunting/issues/29