allows chat button to be displayed when there should be enough space for it

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

Move some styles from SCSS to JSS

- deprecate `INITIAL_TOOLBAR_TIMEOUT`, `TOOLBAR_ALWAYS_VISIBLE`, `TOOLBAR_TIMEOUT`

* feat(toolbox) allow any toolbox button to be displayed as main

fixes the previous behaviour where only a certain set of buttons were whitelisted for being displayed in the main toolbar

* code review

* code review - fix avatar icon position

The feature was not ported to the new toolbar. Arguable these
can all be moved into notification but for now simply the
logic will be removed and worked on again as demand arised.

* ref(info): be able to open dialog through store

* feat(info): automatically show the info dialog

Conditions:
- Lonely call
- Has not opened the info dialog yet

* squash: change to show on start, hide later

* squash: update naming and comment