Board:Nested Boards

Build 3528 on feat-board-component-new-features
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Baseline History
Build 3528e19cc37
Current build. There are unaccepted changes, so build 3523 is still the baseline.
Build 35233670262 current baseline
Accepted by Andrey Yamanov.
Build 35080cdb414
Auto-accepted
Commenting is disabled because there's a newer build on this branch