Read from MessageBlocks/Builds (#10981)

* Added ability to read content of messages and sensing the length of the content.

Also some bundle changes for read/write

* this commit will make mindustry unable to compile trust

* oop missed a space

core/src/mindustry/world/blocks/logic/MessageBlock.java

@@ -14,6 +14,7 @@ import arc.util.io.*;
 import arc.util.pooling.*;
 import mindustry.core.*;
 import mindustry.gen.*;
+import mindustry.logic.*;
 import mindustry.ui.*;
 import mindustry.ui.dialogs.*;
 import mindustry.world.*;
@@ -165,6 +166,14 @@ public class MessageBlock extends Block{
             return !accessible() ? SystemCursor.arrow : super.getCursor();
         }
 
+        @Override
+        public double sense(LAccess sensor){
+            return switch(sensor){
+                case bufferUsage -> message.length();
+                default -> super.sense(sensor);
+            };
+        }
+
         @Override
         public void damage(float damage){
             if(privileged) return;