Move to an improved CommandRouter, improve routing logic

now supports splitting commands over multiple BaseCommands better
should now only match probable @Default handlers, so @CatchUnknown
can still work in obviously wrong scenarios.

@HelpCommand no longer implies @Default as @CatchUnknown will pick it up

example/src/main/java/co/aikar/acfexample/SomeOtherCommand.java

@@ -1,9 +1,11 @@
 package co.aikar.acfexample;
 
 import co.aikar.commands.BaseCommand;
+import co.aikar.commands.CommandHelp;
 import co.aikar.commands.annotation.CatchUnknown;
 import co.aikar.commands.annotation.CommandAlias;
 import co.aikar.commands.annotation.Default;
+import co.aikar.commands.annotation.HelpCommand;
 import co.aikar.commands.annotation.Single;
 import co.aikar.commands.annotation.Subcommand;
 import org.bukkit.command.CommandSender;
@@ -31,4 +33,9 @@ public class SomeOtherCommand extends BaseCommand {
     public void test(Player player, String string, @Default("1") int integer) {
         player.sendMessage("Hi " + string + " - " + integer);
     }
+
+    @HelpCommand
+    public void onHelp(CommandSender sender, CommandHelp help) {
+        help.showHelp();
+    }
 }