Allow setting attributes for all trials

[n-kall]

Currently it seems we need to specify all trial info in every single trial, even when it is completely redundant. For example, in the 'key press' view template, we need to include "key1" and "key2" in each individual trial object.

It would be great if when instantiating the view we could do something like this:

const practice = babeViews.keyPress({
    trials: 12,
    name: 'practice',
    trial_type: 'practice',
    data: practice_trials_info,
    key1: "f",
    key2: "j",
    f: "same",
    j: "different",
});