Add timeout for repeatable challenges.

Relates #71

src/main/java/world/bentobox/challenges/database/object/Challenge.java

@@ -190,6 +190,12 @@ public enum ChallengeType
     @Expose
     private boolean repeatable;
 
+    /**
+     * Timeout for repeatable challenge before it can be completed again.
+     */
+    @Expose
+    private long timeout;
+
     /**
      * Description of the repeat rewards. If blank, it will be autogenerated
      */
@@ -442,6 +448,17 @@ public List<String> getRepeatRewardCommands()
     }
 
 
+    /**
+     * Gets timeout.
+     *
+     * @return the timeout
+     */
+    public long getTimeout()
+    {
+        return timeout;
+    }
+
+
     // ---------------------------------------------------------------------
     // Section: Setters
     // ---------------------------------------------------------------------
@@ -698,6 +715,17 @@ public void setRequirements(Requirements requirements)
     }
 
 
+    /**
+     * Sets timeout.
+     *
+     * @param timeout the timeout
+     */
+    public void setTimeout(long timeout)
+    {
+        this.timeout = timeout;
+    }
+
+
     // ---------------------------------------------------------------------
     // Section: Other methods
     // ---------------------------------------------------------------------
@@ -715,7 +743,7 @@ public void setRequirements(Requirements requirements)
     public boolean matchGameMode(String gameMode)
     {
         return gameMode != null &&
-                this.uniqueId.regionMatches(true, 0, gameMode, 0, gameMode.length());
+            this.uniqueId.regionMatches(true, 0, gameMode, 0, gameMode.length());
     }
 
 
@@ -746,13 +774,11 @@ public boolean equals(Object obj)
             return true;
         }
 
-        if (!(obj instanceof Challenge))
+        if (!(obj instanceof Challenge other))
         {
             return false;
         }
 
-        Challenge other = (Challenge) obj;
-
         if (uniqueId == null)
         {
             return other.uniqueId == null;
@@ -831,6 +857,7 @@ public Challenge clone()
                     collect(Collectors.toCollection(() -> new ArrayList<>(this.repeatItemReward.size()))));
             clone.setRepeatMoneyReward(this.repeatMoneyReward);
             clone.setRepeatRewardCommands(new ArrayList<>(this.repeatRewardCommands));
+            clone.setTimeout(this.timeout);
         }
         catch (Exception e)
         {