Add support for pywal theme

[wowlikon]

Is your feature request related to a problem?

Yes

Describe the solution you'd like

I would like to see support for pywal themes in Materialgram. pywal is a tool that generates a color scheme based on the dominant colors of an image. By integrating pywal, users could customize the appearance of Materialgram to match their wallpaper, providing a more cohesive and personalized experience.

The implementation could involve:

1. Adding an option in the settings to enable pywal theme support.
2. Integrating pywal to generate color schemes based on the user's wallpaper.
3. Applying the generated colors consistently across the application.

Describe alternatives you've considered

1. Manual Color Picker: Allow users to manually select colors for the theme. This would give users full control over the appearance but would require more effort from the user.
2. Predefined Themes: Offer a set of predefined themes that users can choose from. This would be easier to implement but would not provide the same level of personalization as pywal.
3. Third-Party Theme Integration: Integrate with other theme generation tools or services. This could provide similar functionality but might require additional dependencies or services.

Additional context

pywal is a popular tool among users who like to customize their desktop environments. It is widely used in the Linux community and has a strong following. Adding support for pywal themes in Materialgram could attract users who value customization and personalization.