Support user-determined behavior for closing windows.

[Richasy]

Close #32

1. When the user attempts to close the window, a prompt will pop up asking if they would like to hide the application instead of closing it.
2. Add a setting option about this behavior in the settings page.

PR type

What is the purpose of this PR?

• Feature

What is the current behavior?

When the user attempts to close the window, the application will be hidden instead of closed.

What is the new behavior?

Users can adjust this behavior to decide whether closing the window will exit the application.

PR checklist

Please check that your PR meets the following requirements:

• [x] App successfully launched
• [x] New components
  • [x] For controls, the controls have been placed in the Controls folder of the main project
• [x] File headers have been added to all source files
• [x] NOT Contains breaking updates