3-way merge: naming of accept actions

As an occasional user of the 3-way merge, I struggled over the meaning of `Accept` in `Accept current` and `Accept incoming` as seen in code lenses on top:  In my example, both the incoming change and the current change remove something (the `style` calls). But the accept call doesn't accept the change, it just takes the respective outcome. While `Accept combination` takes a combination of the changes. IMO a better name for the commands would be: `Set to Incoming` and `Set to Current`