Have Orikivo.Drawing use System.Drawing.Color classes instead

[AbnerSquared]

Classes such as:

• GammaPalette
• Gamma

These set of classes aren't exactly flexible in how they are used, as they are primarily focused towards providing a set of 8 colors for card palettes, as that is the limit intended. What this fix intends to do, is transfer these inflexible classes over towards their namespace, from which it's better suited for. Orikivo.Drawing is intended to be a freeform graphics class.