Move visible logic inside each button
Move click functionality inside each button
Extract getButtons function from Toolbox components to functions file

*Remove unnecessary @ts-ignores

* feat(a11y) buttons can now have toggled-aware a11y labels

Remove unused icons
Remove fill none from icons
Rename some icons

- add possibility to allow execution of the button's routine besides triggering
`toolbarButtonClicked` API event
- keep backwards compatibility
- get rid of `ToolbarButton`