make debugger fill in event columns on the left (in view of window)

[#1]

Currently, debugger adds new events as columns to the right of existing event table, as they fire. Because this is often off-screen from the user (and the left-right scroll bar is only available at the very bottom of the columns), it makes finding the event you're looking for in a series very difficult:

Current: events fire, then you scroll down, then scroll to the right until you think you're near the events you want, then scroll up and check, and repeat.

Better: events fire, each appearing as a new column closest to the query param labels, and 'pushes' old events out to the right.

That way, a user can simply watch the dimension row they care about as events pop in and find the event they're looking for immediately, no endless scrolling necessary.