other: settings style and formatting

[United600]

Did a pass over the settings to improve XAML readability and be easier to modify or expand.

PR Type

What kind of change does this PR introduce?

• Other... Please describe:

1. Format XAML
2. Refactor settings styles to a separate dictionary
3. Group sections inside a Panel
4. Remove unnecessary custom styles (ToggleSwitch/RadioButton/Slider)
5. Improve spacing consistency
6. Use ComboBox default thickness
7. Font family changes now updates the font size ComboBox
8. Tint opacity slider redesign
9. ComboBox transparent background also applies to the ColorPicker control
10. Add Discord link to contacts
11. Convert RichTextBlock paragraphs to TextBlocks to enable fast path rendering
12. Improve high contrast theme

Notepads-Dev_Text.Editor.mp4

Notepads-Dev_Personaliztion.mp4

Gravacao.2024-04-04.191755.mp4

Notepads-Dev_AdvancedAbout.mp4

Other information

Added some design-time properties and had to change one string name due to the RichTextBlock->TexBlock change.