Declares a serialVersionUID.

Lots of classes here are serializable, but warn due to missing UID. Serializables are supposed to have a UID for version compatability. Fixes a bunch of compiler warnings.

Also adds in "default:" branch to a few switches which were warning due to missing cases.

forge-gui/src/main/java/forge/quest/BoosterUtils.java

@@ -219,12 +219,15 @@ public final class BoosterUtils {
                         preferredColors.addAll(possibleColors);
                     }
                     includeArtifacts = MyRandom.getRandom().nextDouble() < 0.5;
+                    // Fall through
                 case BALANCED:
                     populateBalancedFilters(colorFilters, preferredColors, cardPool, includeArtifacts);
                     break;
                 case RANDOM:
                     populateRandomFilters(colorFilters);
                     break;
+                default:
+                    // Do nothing
 
             }