Debugger: in the tree view, display the white spaces as they're

And in the debug view, display the ltr chars in the same order as they are in showText argument.

Author: calixteman

web/internal/draw_ops_view.css

@@ -141,6 +141,8 @@
 }
 .op-arg {
   color: var(--number-color);
+  direction: ltr;
+  unicode-bidi: bidi-override;
 }
 .changed-value {
   font-weight: bold;

web/internal/tree_view.css

@@ -69,6 +69,7 @@
 
   .str-value {
     color: var(--string-color);
+    white-space: preserve;
   }
 
   .num-value {