Add 'Add to calculation setup' option to context menus

[marc-vdm]

Feature request

General idea
When rightclicked on one or multiple items (Activities, Exchanges or Methods, see below), we should add a sub-menu Add to calculation setup
This sub-menu should be a list with on the top create new calculation setup and all existing ones below that.

Activities
For activities, just add the selected activities with their production amount

Exchanges
For exchanges, where the exchange amount of the source activity is added to that calculation setup.
e.g. I have an activity open with 0.1 kg steel as exchange, then I should be able to add that activity and that amount to a setup.

Methods
This is probably least relevant, but also here it would make sense to be able to add this to the context menus.

Extending this idea
We could also show in those context menus if a method, activity (or source activity of exchange) is used in a setup, though we should only show this for single selections, not multiple. We could also show calculation setups in the Downstream Consumers table of activity details, perhaps in a different table?

Though this last point is perhaps for future UI versions where we can just create something that shows everywhere where that item (whatever it is) is used in AB.