Caleb/task/add defaults config

[CalebKL]

This PR fixes adds ArtMakerDefaults which creates a more flexible solution to customize ArtMaker Composable. You can fully control how the ArtMaker will be displayed by customizing the values of the ArtMakerDefaults object. An example of a customized ArtMakerDefaults configuration is this:

ArtMakerDefaults(
    sliderThumbColor = Color.Black,
    sliderActiveTrackColor = Color.Green,
    sliderInactiveTickColor = Color.Yellow,
    sliderTextColor = Color.Gray,
    color  =listOf(Color.Black, Color.Green, Color.Yellow),
    backgroundColor = Color.Green.toArgb(),
    controllerBackground = Color.Cyan,
    sliderBackground = Color.Blue,
)

For now, the values that are being saved to sharedPreferences have not been added to the the defaults config because we need to have more discussions about this. Fixes #35