Add unpause as an alias for resume

Some people can't seem to find out what to do to unpause baritone, so this should hopefully help them figure it out, as for some reason unpause makes more sense to people than resume.

src/main/java/baritone/command/defaults/ExecutionControlCommands.java

@@ -112,7 +112,7 @@ public class ExecutionControlCommands {
                 );
             }
         };
-        resumeCommand = new Command(baritone, "resume", "r") {
+        resumeCommand = new Command(baritone, "resume", "r", "unpause") {
             @Override
             public void execute(String label, IArgConsumer args) throws CommandException {
                 args.requireMax(0);