Make Remove Double Vertices operator available to all mesh selection mode context menus.
Removing doubles is a staple operator and a frequently used cleanup and optimization tool.
In pre 2.8 one could remove doubles from any selection mode, Vertex, Edge, or Face by accessing the W > Specials menu .
Currently in 2.8 we now have the new and improved W > Mesh Context Menu, but Remove Double Vertices is only available while in Vertex selection mode. While this makes sense from an organizational point of view, in day to day usage it is probably more of an annoyance, forcing you to needlessly switch modes for such a common task, when it works well regardless of selection mode.
I think this fits well here since it is probably just a simple UI change of adding the entry to the menus.