Ignore certain parameters like timing_stim during live editting

[GavinQ1]

No description provided.

[jodeleeuw]

Let's leave this open until we get it working through the plugin files.

[jodeleeuw]

@GavinQ1 @kristiyip This is another thing that we need to work on that involves changes to both the GUI and to jsPsych itself. We should flag certain parameters as "ignored" during live editing. We can add a live_edit_value parameter to any params that should be ignored (usually timing parameters that would cause the experiment to hide). Whatever value is passed in there is used during live edit mode. Let's try and get this working as a proof of concept with the image-keyboard-response plugin, where stim_duration and trial_duration should both have live_edit_value: -1.