diagnostic: try to detect use of range expression and recommand to use number

Several users have been asking if it is possible to use range
expression.
Detect this and have a meaningful error message

internal/compiler/tests/syntax/basic/for.slint

@@ -20,4 +20,8 @@ export SuperSimple := Rectangle {
         Rectangle {}
     }
 
+    for x in 0..32: Rectangle { }
+    //          ^error{Parse error. Range expressions are not supported in Slint. You can use an integer as a model to repeat something multiple time. Eg: `for i in 32 : ...`}
+
+
 }