<p>I rebased and squashed this PR to current master and also moved all the unrelated stuff to separate PRs (<a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="467437495" data-permission-text="Issue title is private" data-url="https://github.com/RIOT-OS/RIOT/issues/11835" data-hovercard-type="pull_request" data-hovercard-url="/RIOT-OS/RIOT/pull/11835/hovercard" href="https://github.com/RIOT-OS/RIOT/pull/11835">#11835</a>, <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="467447588" data-permission-text="Issue title is private" data-url="https://github.com/RIOT-OS/RIOT/issues/11836" data-hovercard-type="pull_request" data-hovercard-url="/RIOT-OS/RIOT/pull/11836/hovercard" href="https://github.com/RIOT-OS/RIOT/pull/11836">#11836</a>, and <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="467462719" data-permission-text="Issue title is private" data-url="https://github.com/RIOT-OS/RIOT/issues/11837" data-hovercard-type="pull_request" data-hovercard-url="/RIOT-OS/RIOT/pull/11837/hovercard" href="https://github.com/RIOT-OS/RIOT/pull/11837">#11837</a>).</p>

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