Refactor damage source checking and restructure player management

The source of damage detection for PvP interactions has been updated to improve accuracy and flexibility. A 'Target' sub-class has been implemented in the PlayerManager class, removing the need for a separate DamageCheck class. The PlayerManager class was also moved to the 'data' package. Distribution of feedback messages has been simplified using the new DamageCheckResult class.

src/main/java/me/youhavetrouble/preventstabby/api/PreventStabbyAPI.java

@@ -1,7 +1,9 @@
 package me.youhavetrouble.preventstabby.api;
 
 import me.youhavetrouble.preventstabby.PreventStabby;
+import me.youhavetrouble.preventstabby.data.DamageCheckResult;
 import me.youhavetrouble.preventstabby.util.PvpState;
+import org.bukkit.entity.Entity;
 
 public class PreventStabbyAPI {
 
@@ -19,5 +21,9 @@ public class PreventStabbyAPI {
         PreventStabby.getPlugin().getPlayerManager().setForcedPvpState(newForcedPvpState);
     }
 
+    public static DamageCheckResult canDamage(Entity attacker, Entity victim) {
+        return PreventStabby.getPlugin().getPlayerManager().canDamage(attacker, victim);
+    }
+
 }