VO8-WT Walkthrough of SW unit design specification for QSR 1.1

Walkthrough of SW unit design specification for QSR 1.1.
See https://bugreports.qt.io/browse/QSR-228

All review comments should be available via this sub-task.

The definition of done (DoD) for the walkthrough review:

Document adheres to documentation guidelines in the Qt Safe Renderer 1.1 Safety Plan
    1a) location
    1b) naming
    1c) progress tracking
    1d) change control
    1e) review policy
    1f) requirements for documents

Document has been verified according to QSR 1.1 Verification Specification.
See document in Sharepoint: https://qtcompany.sharepoint.com/:w:/r/sites/QtQuality/_layouts/15/Doc.aspx?sourcedoc=%7B854D5752-AF13-4622-A835-0913E0FAA4A3%7D&file=Qt_Safe_Renderer_Verification_Specification.docx&action=default&mobileredirect=true