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Add alloy-editor-button class to all buttons
Hide Toolbars on focusing other element on the page.

Fixes #30
Add .editorconfig file
SF
Make Toolbars keyboard accessible

Fixes #17
Make Toolbars keyboard accessible - improve and simplify the code

Fixes #17
Fix clash in ESC key processing.

The Toolbars for handling styles and images need to handle in a special way ESC key.
This clashes with WidgetAutohide extension, so it will be removed from the toolbars.

Fixes #56
Make button for adding link accessible - WIP

Fixes #57
Make button for adding link accessible

Fixes #57