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

Create Shortcuts tab in Settings Dialog
Move keyboard shortcut option from More to this tab
Move shortcuts info from KeyboardShortcuts dialog to this tab
Remove KeyboardShortcuts dialog

Remove unused icons
Remove fill none from icons
Rename some icons

Convert files that use material-ui to TS (needed for material-ui upgrade)

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

* 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