Server browser column sort should be numerical on some columns

[Al Riddoch]

The server browser allows servers to be sorted based on different columns. The rows are then sorted according the contents of the field in that column. A common use case for this feature is to sort servers by ping time to find one with a suitably low value, but selecting this column sorts the contents by the string contents of the field rather than sorting numerically which places the rows in an order which is much less useful.

[Erik Ogenvik (erik-ogenvik)]

The issue here is that CEGUI doesn't allow for the sort type to be specified per column (i.e. all are sorted by textual comparison). The fix would therefore go into CEGUI.