Editor: focus on ID input field on clone/add

When you create or clone a class you have to enter a new ID in an input field at the very bottom. Unfortunately, that field is not focused when an ID has to be given. So in order to to enter an ID you have to move the mouse to the very bottom and click in that field. Even more: you could accidentally overwrite data of another class because the focus stays on the last edited field of that other class.

It would be nice if that input field gets the (input) focus automatically.

It would be nice as well if the ID input field would be above the table that shows the data instead of below it. If I want to edit data of an omwaddon I usually click on "Modifyed ↓↑" which brings those (modified entries) to the top of the table, I bet other modders will do it like that, too. Men do usually go top -> down, the menu is on the top etc.

howto reproduce:

1. Look for ID "wulf" (or any other ID) in the "referencables" window.
2. Right-click on the script field of "wulf" and choose "add" or "clone".
3. Type an ID for the new entry now. You will see, that - what you write - will overwrite wulf->script because it still has the focus.

I'm not sure if this can be marked as Bug, so I made it a Feature...

(RM-2514 from redmine: created on 2015-04-30 by Who Knows, , closed on 2015-05-02 by Marc Zinnschlag)