Prepare component ids for selenium tests

Author: sxprz

src/ui/panel/Panel.re

@@ -19,6 +19,7 @@ let make_nav_pills = (current, dispatch) => {
      |> List.mapi((i, (v, n)) => {
           <li key={string_of_int(i)} className="nav-item">
             <a
+              id={"nav-item-" ++ string_of_int(i)}
               href="#"
               className={"nav-link" ++ (current == Some(v) ? " active" : "")}
               onClick={on_click(`SwitchPanel(Some(v)))}>

src/ui/panel/ParameterView.re

@@ -335,7 +335,7 @@ let make = (~goblint_path, ~inputValue, ~setInputValue, ~disableRun, ~setDisable
 
     let list_elements = history |> map_history_entry_to_list_entry;
 
-    <div>
+    <div id="parameterview">
         <div className="input-group mb-2 has-validation">
             <Button disabled={disableRun} on_click={on_submit}>
                 <IconPlay />