Added basis for server-side cooldown checks, added warmup checks, closed #273

Note that cooldown check is currently used only for the holoemote
command. To add a cooldown to any command, all you have to do is
CreatureObject.addCooldown(name). In this commit I also moved some
cooldown variables from CombatCommand to BaseSWGCommand since many
non-combat commands had cooldowns (Wookie Roar, Holo-Emotes). I also put
in a warmup cooldown (time before command is called) for non-combat
commands.

src/resources/common/Cooldown.java

@@ -0,0 +1,62 @@
+/*******************************************************************************
+ * Copyright (c) 2013 <Project SWG>
+ * 
+ * This File is part of NGECore2.
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ * 
+ * Using NGEngine to work with NGECore2 is making a combined work based on NGEngine. 
+ * Therefore all terms and conditions of the GNU Lesser General Public License cover the combination.
+ ******************************************************************************/
+package resources.common;
+
+import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledFuture;
+import java.util.concurrent.TimeUnit;
+
+public class Cooldown {
+	private long startTimestamp;
+	private long endTimestamp;
+	
+	private ScheduledFuture<?> removalTask;
+
+	public Cooldown(long end) {
+		startTimestamp = System.currentTimeMillis();
+		endTimestamp = startTimestamp + end;
+	}
+
+	public long getStartTimestamp() {
+		return startTimestamp;
+	}
+
+	public void setStartTimestamp(long startTimestamp) {
+		this.startTimestamp = startTimestamp;
+	}
+
+	public long getEndTimestamp() {
+		return endTimestamp;
+	}
+
+	public void setEndTimestamp(long endTimestamp) {
+		this.endTimestamp = endTimestamp;
+	}
+
+	public ScheduledFuture<?> getRemovalTask() {
+		return removalTask;
+	}
+
+	public void setRemovalTask(ScheduledFuture<?> removalTask) {
+		this.removalTask = removalTask;
+	}
+}