If a control is contained in a wxStaticBoxSizer or its child sizer,
wxStaticBoxSizer::GetStaticBox() should be used as the control's parent.
However, widgets and dialogs samples did not do that, which resulted in
flooding the message log in widgets sample with warnings about this; in
dialogs sample the warnings were shown in the debug output.
Fix this by always using the static box as the control's parent when the
control is contained (directly or indirectly) in a wxStaticBoxSizer.
Closes#23967.
This is a combination of running clang-tidy with modernize-use-nullptr
check for some ports (GTK, X11, OSX) and manual changes to the ports for
which it couldn't be used easily (MSW, DFB) and also manually updating
the docs.
Also replace NULL with null or nullptr in the comments as this is more
consistent with the use of nullptr in the code and makes it simpler to
grep for the remaining occurrences of NULL itself.
And also use null in the assert messages.
Only a few occurrences of "NULL" are still left in non-C files, mostly
corresponding to unclear comments or string output which it might not be
safe to change.
