Core changes

A growing list of implemented 8.0 changes so we don't loose track

Breaking

jsPsych.setProgressBar() and jsPsych.getProgressBarCompleted() => jsPsych.progressBar.progress
Automatic progress bar updates after every trial now, including trials in nested timelines
jsPsych.timelineVariable() => jsPsych.timelineVariable() and jsPsych.evaluateTimelineVariable()
Drop jsPsych.data.getDataByTimelineNode() since nodes have no IDs anymore
Trial results do no longer have the internal_node_id property
save_trial_parameters can only be used to remove parameters that are specified in the plugin info
endExperiment() and endCurrentTimeline() => abortExperiment() and abortCurrentTimeline()