26796 [Material] Theme data type for cards (cla: yes, f: material design, framework)

26797 Update VERSION_WIN_SDK (cla: yes, team, ❖ platform-windows)

26798 targetSdkVersion 28 (cla: yes, d: examples, team, ▣ platform-android)

26807 #19060 Update material.google.com links to material.io (cla: yes, d: api docs, f: material design, framework, team)

26808 Add Checkbox checkIcon color parameter (cla: yes, f: material design, framework)

26809 Fix test expectations per change made in #26736 (cla: yes, team)