Read Length of Strings (#10611)

* added ability to sense length of charsequences

* documentation

* Update core/assets/bundles/bundle.properties

Co-authored-by: Jason <131086642+JasonP01@users.noreply.github.com>

---------

Co-authored-by: Anuken <arnukren@gmail.com>
Co-authored-by: Jason <131086642+JasonP01@users.noreply.github.com>

core/src/mindustry/logic/LExecutor.java

@@ -652,6 +652,10 @@ public class LExecutor{
                     }
                 }
             }else{
+                if(target instanceof CharSequence seq && sense == LAccess.size){
+                    to.setnum(seq.length());
+                    return;
+                }
                 to.setobj(null);
             }
         }