Change variable name style to reflect that it is a constant

Signed-off-by: Chris Cromer <chris@cromer.cl>

src/main/java/cl/cromer/azaraka/Constants.java

@@ -37,7 +37,7 @@ public interface Constants {
 	/**
 	 * The heuristic to use in the AI distance calculations
 	 */
-	AIHeuristic aIHeuristic = AIHeuristic.MANHATTAN;
+	AIHeuristic AI_HEURISTIC = AIHeuristic.MANHATTAN;
 	/**
 	 * Which type of AI to use
 	 */

src/main/java/cl/cromer/azaraka/ai/PlayerAI.java

@@ -74,7 +74,7 @@ public interface PlayerAI extends Runnable, Constants {
 	 * @return Returns the distance between the states
 	 */
 	default double heuristic(State start, State goal) {
-		switch (aIHeuristic) {
+		switch (AI_HEURISTIC) {
 			case DIAGONAL:
 				return Math.max(Math.abs(start.getX() - goal.getX()), Math.abs(start.getY() - goal.getY()));
 			case EUCLIDEAN: