overrideContext <- might need to rename internals

[vegarringdal]

overrideContext

https://github.com/vegarringdal/vGrid/blob/dev-rebuild/src/grid/contextMenu.ts#L124-L133

Might need to rename some of the variables here, since it will be very easy to override by accident.
Since entire class is binded to the menu I need to consider prefixing evything with avg_

I need to look if I have this issue elsewhere too

Other option can be that I force user to define a object in class using the grrid, that way its harder to miss, and if component have many grids you wont crash