download: improved images download from scryfall source:

- fixed wrong timeouts for api (fixed 429 Too Many Requests);
- added any/10 parallel threads support;
- current api limit is 1 request per 300 ms;

Mage/src/main/java/mage/cards/decks/importer/CardLookup.java

@@ -52,7 +52,7 @@ public class CardLookup {
             if (result.isPresent()) {
                 return result;
             }
-        } catch (NumberFormatException ignored) {
+        } catch (NumberFormatException ignore) {
             /* ignored */
         }
 

Mage/src/main/java/mage/util/ThreadUtils.java

@@ -51,7 +51,7 @@ public final class ThreadUtils {
     public static void sleep(int millis) {
         try {
             Thread.sleep(millis);
-        } catch (InterruptedException ignored) {
+        } catch (InterruptedException ignore) {
         }
     }