Add ability to customize accent colour

[khuffie]

The default colour is blue for PermissionsSwiftUI, which doesn't quite work with my app's design.

For the permission images, I can pass in custom images and provide them with my preferred accent colour.

For the buttons, there seems to be no way to customize them. I see in the source code "ButtonStatusColor", but as it's not a public class I cannot extend it and over-ride it.

Being able to pass in an accent colour that when calling .JMModal would be great!

[jevonmao]

@khuffie Great suggestion. This feature will be added ASAP!

[khuffie]

@jevonmao that's great! Let me know, anxious to release it :)

(PS: it would be good if the accent colour also affects the images :)

[jevonmao]

@khuffie It's done! Worked on the project for the entire afternoon, and in the latest 1.2.2 release, you should be able to customize all the buttons, all the colors, for all states.
Use the setAllowButtonColor(to colors:AllButtonColors) view modifier

[jevonmao]

@khuffie Actually, looking at this new API, it's badly designed. I don't like it, too complicated and unnecessary. I will rework this feature, and use a single modifier to change accent color of buttons and the image icons.

[khuffie]

@jevonmao no worries! Take your time :)

[jevonmao]

@khuffie The feature is ready!. Please update to v1.2.3, and reference README.md if needed.