Accessibility icon set
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## Icon Request

* Icon name: Walking, stairs, escalators, lifts, toilets, disability-related icons (wheelchair, etc.)
* Tags of this icon: Accessibility or Wayfinding
* Use case: Visitors information
* Screenshots of similar icons:
![image](https://user-images.githubusercontent.com/57035648/67620163-f50d0a00-f82d-11e9-8266-8127a019c182.png)

![image](https://user-images.githubusercontent.com/57035648/67620160-e4f52a80-f82d-11e9-8c70-60c342ec2fb7.png)

