feat: add IridiumColorAPI utility for advanced text coloring and gradients

src/main/java/eu/milujukockoholky/vexliolobby/utility/color/IridiumColorAPI.java

@@ -171,6 +171,9 @@ public class IridiumColorAPI {
 	 */
 	private static ChatColor[] createRainbow(int step, float saturation) {
 		ChatColor[] colors = new ChatColor[step];
+		if (step <= 0) {
+			return colors;
+		}
 		double colorStep = (1.00 / step);
 		for (int i = 0; i < step; i++) {
 			Color color = Color.getHSBColor((float) (colorStep * i), saturation, saturation);
@@ -194,6 +197,13 @@ public class IridiumColorAPI {
 	 */
 	private static ChatColor[] createGradient(Color start, Color end, int step) {
 		ChatColor[] colors = new ChatColor[step];
+		if (step <= 0) {
+			return colors;
+		}
+		if (step == 1) {
+			colors[0] = SUPPORTS_RGB ? ChatColor.of(start) : getClosestColor(start);
+			return colors;
+		}
 		int stepR = Math.abs(start.getRed() - end.getRed()) / (step - 1);
 		int stepG = Math.abs(start.getGreen() - end.getGreen()) / (step - 1);
 		int stepB = Math.abs(start.getBlue() - end.getBlue()) / (step - 1);