#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/SeparateSaltMethod.java

@@ -12,14 +12,14 @@ public abstract class SeparateSaltMethod implements EncryptionMethod {
     public abstract String generateSalt();
 
     @Override
-    public HashResult computeHash(String password, String name) {
+    public EncryptedPassword computeHash(String password, String name) {
         String salt = generateSalt();
-        return new HashResult(computeHash(password, salt, name), salt);
+        return new EncryptedPassword(computeHash(password, salt, name), salt);
     }
 
     @Override
-    public boolean comparePassword(String hash, String password, String salt, String name) {
-        return hash.equals(computeHash(password, salt, null));
+    public boolean comparePassword(String password, EncryptedPassword encryptedPassword, String name) {
+        return encryptedPassword.getHash().equals(computeHash(password, encryptedPassword.getSalt(), null));
     }
 
     @Override