#358 Handle hash + salt as one "unit"

- Rename HashResult to EncryptedPassword to reflect its broader use
- Use EncryptedPassword in methods that require the hash and the salt, instead of passing them as strings separately
- Store EncryptedPassword as field in PlayerAuth; updatePassword() thus processes the entire data in the EncryptedPassword object

src/main/java/fr/xephi/authme/security/crypts/HexSaltedMethod.java

@@ -20,13 +20,13 @@ public abstract class HexSaltedMethod implements EncryptionMethod {
     public abstract String computeHash(String password, String salt, String name);
 
     @Override
-    public HashResult computeHash(String password, String name) {
+    public EncryptedPassword computeHash(String password, String name) {
         String salt = generateSalt();
-        return new HashResult(computeHash(password, salt, null));
+        return new EncryptedPassword(computeHash(password, salt, null));
     }
 
     @Override
-    public abstract boolean comparePassword(String hash, String password, String salt, String name);
+    public abstract boolean comparePassword(String password, EncryptedPassword encryptedPassword, String name);
 
     @Override
     public String generateSalt() {