#494 Fix conversion plaintext to SHA256

- Make sure database is set up before attempting to perform the migration

src/main/java/fr/xephi/authme/security/PasswordSecurity.java

@@ -113,7 +113,7 @@ public class PasswordSecurity {
      */
     private static EncryptionMethod initializeEncryptionMethodWithoutEvent(HashAlgorithm algorithm) {
         try {
-            return HashAlgorithm.CUSTOM.equals(algorithm)
+            return HashAlgorithm.CUSTOM.equals(algorithm) || HashAlgorithm.PLAINTEXT.equals(algorithm)
                 ? null
                 : algorithm.getClazz().newInstance();
         } catch (InstantiationException | IllegalAccessException e) {

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

@@ -11,7 +11,7 @@ import fr.xephi.authme.security.crypts.description.Usage;
  * and store the salt with the hash itself.
  */
 @Recommendation(Usage.ACCEPTABLE)
-@HasSalt(SaltType.TEXT) // See saltLength() for length
+@HasSalt(SaltType.TEXT) // See getSaltLength() for length
 public abstract class HexSaltedMethod implements EncryptionMethod {
 
     public abstract int getSaltLength();