* allow customizing functional key layouts
* slightly adjust symbols and more symbols layouts
* add options to auto-show/hide toolbar
* add toast notification when copying text
* separate language switch key behavior from enablement
* add comma key popups for number and phone layouts
* make long-press pinning in toolbar optional
* move toolbar settings to a separate section
* add tab key
* understand ctrl, toolbar and other key labels in layouts
* minor fixes and improvements
