ManageFeatures rework

[williambohrmann3]

Description

This PR aims at restructuring the code for increased readability.

• Bug fix: Delete features button wasn't appearing on MAUI
• Organize code into regions, chronological
• Modify and remove some helper methods
• Updates readme with operation-specific instructions
• Minor UI tweaks
• Some variable renames
• Code style

I apologize for the large git diff.

Type of change

• Bug fix
• Other enhancement

Platforms tested on

• WPF .NET 6
• WPF Framework
• WinUI
• MAUI WinUI
• MAUI Android
• MAUI iOS
• MAUI MacCatalyst

Checklist

• Self-review of changes
• All changes work as expected on all affected platforms
• There are no warnings related to changes
• Code is commented and follows .NET conventions and standards
• Codemaid and XAML styler extensions have been run on every changed file
• No unrelated changes have been made to any other code or project files
• Screenshots are correct size and display in description tab (800 x 600 on Windows, MAUI mobile platforms use the MAUI Windows screenshot)

[williambohrmann3]

A note about changing the orders of some of the methods, this was my methodology:

1. Constructer
2. Initialize
3. Feature management operations organized into 3 regions (Create is one function only)
4. Other event handlers
5. Helper method

Again, I apologize for the git diff, I hope this organization makes the code slightly more readable.

[duffh]

Looks good