Revert needed, since otherwise there is no way to do automatic sorting
of includes.
Also reverted change to the docs, as leaving it would make incorrect
docs.
In case of conflicts, includes were sorted according to the coding
standards from #3839.
This reverts commit b4a9f04f92.
This reverts commit 5921122960.
Someone was connecting a singal to a lambda capturing this, and never disconnecting it in the destructor. Capturing this is DANGEROUS, kids, don't do this at home.
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