started job of putting code into shared library

[pedrosbanioles]

• add abstractions for
  • IUartProvider, with XmlUartProvider implementation
  • INotificationHandler for deferring notifications to another handler, allows re-defining of notifications instead of DialogBox
  • added models for notifications
• moved isolated functions into extension methods
• incorporated Dependency Injection using IServiceCollection and IServiceProvider to facilitate unit testing
• Created UART.Core for shared code between CLI and Forms project
• Upgraded projects to .net8.0 for longer term support
• Logical refactoring for PS5 Nor Modifier project to reduce nesting
• Fix exception bug on GUI Launch, add checks for items in port array before setting index