Refactor InnerBrowser class

[ghost]

General refactor to file InnerBrowser.php.

This PR...

• makes it easier to navigate through the class.
• reduces the file size from 2065 lines to 1626.
• does not make logic changes.
• creates individual traits responsible for the implementation of each interface used in the class.
• respect the order of implementation of the methods.
• organizes the methods: private first, protected second and public last.
• alphabetize methods.
• uses ʻuse` statements if possible.
• adds BrowserInterface to see clearly (without docblocks or code implementation) which public methods this class provides.