3.0.0 Improve functionality

Now some tab switching can be detected, and the instruction reading times are recorded. It is also easier to add a rest (this part is untested though so use with caution). The example experiment now detect space key to screen out touch device, and hCaptcha is used to screen out bots.

For privacy reasons, Mturk, Prolific, and sona ID recording is stripped. Sona credit can be automatically granted without recording ID as long as the study is properly configured on the Sona system.