Fix rare crash in RandomSpriteProvider

This was caused by RandomIndexProvider.Unweighted using Math.abs, meaning it could return a negative value if the passed seed was equal to Integer.MIN_VALUE. This commit replaces Math.abs with a function that sets the sign bit to 0.

Fix #616

Author: PepperCode1

src/main/java/me/pepperbell/continuity/client/util/MathUtil.java

@@ -48,4 +48,8 @@ public static int mix32(long z) {
 	public static int mix(int x, int y, int z, int face, int loops) {
 		return mix32((MathHelper.hashCode(x, y, z) ^ mix64(GOLDEN_GAMMA * (1 + face))) + GOLDEN_GAMMA * (1 + loops));
 	}
+
+	public static int removeSignBit(int value) {
+		return value & 0x7FFFFFFF;
+	}
 }

src/main/java/me/pepperbell/continuity/client/util/RandomIndexProvider.java

@@ -16,7 +16,7 @@ public Unweighted(int size) {
 
 		@Override
 		public int getRandomIndex(int random) {
-			return Math.abs(random) % size;
+			return MathUtil.removeSignBit(random) % size;
 		}
 	}
 
@@ -43,7 +43,7 @@ public Weighted(int[] weights, int weightSum) {
 		@Override
 		public int getRandomIndex(int random) {
 			int index;
-			int tempWeight = Math.abs(random) % weightSum;
+			int tempWeight = MathUtil.removeSignBit(random) % weightSum;
 			for (index = 0; index < maxIndex && tempWeight >= weights[index]; index++) {
 				tempWeight -= weights[index];
 			}