- focus state inherits from hover (as per existing component focus styles)
- existing @visited vars are only used by components so grouped with content item

- focus state inherits from hover (as per existing focus styles)
- locked state inherits from disabled (as per existing locked styles)

- Replace @btn-ui-color vars with @ui-color vars. Nav, Notify and Drawer btns inherit from their view colours. This sets an extra level of vars to define global ui colors or edit these separately as per existing Vanilla.
- rename _buttonStates.less file to _state-mixins.less.

- ui-btn-controls vars added
- shared Notify and Drawer btn styles combined into single ui-btn--controls mixin. Replacing .notify-btn-icon mixin.

- set menu item btn vars to inherit from item ui

- item ui locked state added
- set .narrative__strapline-icon to inherit from narrative__strapline-btn to reduce additional state declaration styles

…ntrib-vanilla into issue/469

… controls and strapline

- Narrative strapline icon background color set to transparent to prevent icon background obscuring the btn focus outline

…ntrib-vanilla into issue/469

- border-radius added
- default drawer item vars represent current drawer styles
- margin gives option to display items in a 'button style'
- when margin is set, apply border to whole of button (not just bottom)

- drawer item selected state expanded to support aria-current="true" (used by languagepicker which should inherit selected, not disabled styling.

…ntrib-vanilla into issue/469

- share border-width variable between drawer and notify UI button controls
- remove reference to 'color' from border width variables
- change reference from 'icon' to 'btn' for nav ui border-width variable for consistency with other nav btn spacing variables
- move border-width variables into spacing less
- set menu item to inherit its own border-radius variable

…nt breaking change

…vent breaking change

…acy support only - prevent breaking change

- @nav-icon-locked and @nav-icon-disabled color vars added

transparent buttons could be problematic accessibility wise

- align focus and selected styles with 'master'
- remove 'outline' box-shadow in favour of border. Border is used to visually distinguish/separate each item whilst box-shadow is stylistic only

...file doesn't include states or mixins