Add getComboxBoxItems method to DefaultCommandHandler and app-connection.ts

[source-streamer]

Describe what your code does

This adds a method to get all the text values for the items in a ComboBox, as an array in order if indeces of the items.

Is this pull request to fix a bug?

n/a

Is this pull request to extend the functionality of the codebase?

This extends the methods on the ComboBox to allow for easily getting all items in the combo box. This can serve the purpose of multiple testaces:

• Validate quickly that all required items are present and in the correct order
• When the contents of a ComboBox are dynamic, and you need to set a specific item as selection, this allows you to easily find the index of a specific item (e.g. with different test machines using different audio devices, this would allow finding the same virtual audio device by name on each machine).

Is the code tested?

Yes, the code is tested using the example app and the example test specs.

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• I agree to assign copyright of any code accepted via this pull request process to Focusrite Audio engineering Ltd.

[ImJimmi]

This is a great addition, thanks!

If you could address my suggestion about not failing if there are no items, I'd be happy to approve and get this merged!

[hiddekramermusic]

@ImJimmi just in case you missed the updates, your suggestions have now been added.