Add event for commands and make __on_player_message not trigger for them (#1525)

* Restoring old behaviour of __on_player_message

Fixes #1511

* Changed to PLAYER_COMMAND

* Updated docs

* Updated event_test.sc

* Updated editor keywords

* Fixed issue

src/main/java/carpet/script/CarpetEventServer.java

@@ -921,6 +921,13 @@ public class CarpetEventServer
             }
         };
 
+        public static final Event PLAYER_COMMAND = new Event("player_command", 2, false) {
+            @Override
+            public boolean onPlayerMessage(ServerPlayer player, String message) {
+                return handler.call( () -> Arrays.asList(new EntityValue(player), new StringValue(message)), player::createCommandSourceStack);
+            }
+        };
+
         public static final Event STATISTICS = new Event("statistic", 4, false)
         {
             private <T> ResourceLocation getStatId(Stat<T> stat)