Make parameter search widget have a horizontal limit

Objective:

* Cut off really long parameter names with ellipsis

Changes:

ve.ui.Widget.css
* Use ellipsis when option labels get too long

ve-mw/ve.ui.Widget.css
* Limit the size of a parameter result widget label - this is a hack, but
  since there are strange bugs with using ellipsis together with % based
  width, it's the best we can do for now

Bug: 50800
Change-Id: Idbfa336d2bba376b0d078fdd0ece65926d610d81
Merge "Make parameter search widget have a horizontal limit"