If a stimConfig file is loaded at the CLI, this is not reported in the GUI

[raacampbell]

Loading a stim config file at the CLI does not update the GUI state to indicate this happened.

To Reproduce
Steps to reproduce the behavior:

1. start_zapit
2. fn = fullfile(zapit.updater.getInstallPath,'examples','example_stimulus_config_files','uniAndBilateral_5_conditions.yml');
3. hZP.loadStimConfig(fn)
4. hZP.stimConfig % Yes it is loaded

But GUI does not report this.

How to fix

The code that loads the file and updates the GUI in zapit.gui.main.controller.loadStimConfig_Callback needs to be separated. The GUI update should run based on a callback that fires when the stimConfig changes.