Create the project browser

        This creates a combobox brower for projects
        and adds it to the ui

        :returns: the created combo box browser
        :rtype: :class:`jukeboxcore.gui.widgets.browser.ComboBoxBrowser`
        :raises: None

def create_prj_browser(self, ):
        """Create the project browser

        This creates a combobox brower for projects
        and adds it to the ui

        :returns: the created combo box browser
        :rtype: :class:`jukeboxcore.gui.widgets.browser.ComboBoxBrowser`
        :raises: None
        """
        prjbrws = ComboBoxBrowser(1, headers=['Project:'])
        self.central_vbox.insertWidget(0, prjbrws)
        return prjbrws