Code Quality: Use Files.App.Data for data models

[0x5bfa]

Description

This quality improvement is on going. You can see what kind work is in progress in the bottom, GitHub Issue Timeline.

• Wrong namespace cause mislead.
• Putting classes together in to the same folder make Solution Explorer looks terrible.

Concerned code

Whole Files.App project

Gains

• A better readability.
• A better maintainability.

Requirements

• Do one class per file
• Don't use unofficial workds such as Params and Nav except Args(Rationale: Used in System.EventArgs).
• Organize classes.

Comments

No response

[yaira2]

@d2dyno1 are you on board for this?

[d2dyno1]

Yep, I agree that we should have a data separation👍

[0x5bfa]

This was done by #12233.