Add sorting to tables

[Laoujin]

Allow sorting on tables.

For consultant names: should be able to sort on last name and first name.

Or maybe we need to display consulants like "LastName FirstName" instead --> to be checked with back office (check met Jelle)
(or maybe this could be configuration?)

[Laoujin]

Hover over the th cell --> show sort icons
Click on sort icons to toggle between: no sort, asc, desc

If no sorting is present then use the custom or default sort (this is sometimes a special sorting, ex in Projects)

Optional:
Sort on multiple columns by pressing shift + click