Merge branch 'master' of https://github.com/Anuken/Mindustry into 7.0-features

core/src/mindustry/content/Blocks.java

@@ -2329,11 +2329,15 @@ public class Blocks implements ContentList{
         payloadSource = new PayloadSource("payload-source"){{
             requirements(Category.units, BuildVisibility.sandboxOnly, with());
             size = 5;
+            alwaysUnlocked = true;
+            group = BlockGroup.units;
         }};
 
         payloadVoid = new PayloadVoid("payload-void"){{
             requirements(Category.units, BuildVisibility.sandboxOnly, with());
             size = 5;
+            alwaysUnlocked = true;
+            group = BlockGroup.units;
         }};
 
         //TODO move