Make outlets in ChatInputBar open

The class is declared open, but the outlets are not. This means that subclassing is pretty pointless. Making the outlets open would enable quite a bit of selective customization (e.g. keyboard customization on the text view).

Locate the ChatInputBar class and inspect its outlet declarations. Make the outlets available for subclass customization, then build the project and verify that a subclass can selectively customize them, including the text view keyboard behavior.

Written by the indexing model from the issue text.