Allow pasting url in download object dialog

[Zverikk]

For example:

1. Copy url from some website, like ​http://www.openstreetmap.org/browse/relation/1396080/
2. Open File -> Download Object
3. Focus to ID text field
4. Paste URL
5. Automatically: a) object type is determined; b) insted of url, object id is determined and replaces url in text field
6. Press OK, download an object.

Also, could we have text field focused instead of object type box when opening the dialog?

[akks]

In 5354/josm:

See #5984: Automatic pasting of IDs or URL into Download Object fields

[akks]

I have added this functionality in slightly different manner - URL is parsed automatically, not on Ctrl-V.

Also, if ID or ID list is in clipboard, it is pasted "as is", user needs to select the type by combobox then.

I did not manage to preselect tfId in Extended dialog because the default button is focused on showDialog().