#358 Start refactoring PasswordSecurity

- Add new methods temporarily to NewEncrMethod interface
   - No data source access within EncryptionMethod implementations
   - Generate the salt within the EncryptionMethod implementation
- Deprecate static methods on PasswordSecurity
- Adjust AbstractEncryptionMethodTest to test the classes with the new interface
- Add getter for data source instead of accessing field directly

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

@@ -29,11 +29,8 @@ public interface EncryptionMethod {
      *
      * @return True if the password matches, false otherwise
      */
+    @Deprecated
     boolean comparePassword(String hash, String password, String playerName)
         throws NoSuchAlgorithmException;
 
-    // String generateSalt();
-
-    // String computeHash(String password, String name);
-
 }