Update to clang-format-5 and reformat the codebase 

Refs #22647

When compiled with gcc the SingletonHolder instance symbols
are marked as globally unique (a GNU extension) but when compiled
with clang the symbols are marked as weak. Python extensions
are loaded by default without either RTLD_GLOBAL or RTLD_LOCAL
specified and the singleton symbols then remain private to each
module leading to multiple singleton instances within the same
process. This fix will also cover older versions of LD and is
a cleaner implementation than that removed in
afa941f0.

This was a request after seeing #23083.

This will allow users to have logging again

The table has only just been created, so does not contain any rowa, so removeRow(0) fails.
re #22918

Primarily throwing exceptions rather than logging when there is an error.
This reports better to python, and prevents silent problems.
re #22918

MSVC 2017 15.7 contains a bug where constant initialization no longer
takes place for objects with constructors marked constexpr such as
once_flag. This leaves once_flag susceptible to dynamic initialization
order problems and causes some singleton instances to be constructed
incorrectly. We put back our correct implementation (with some cleanup)
and await a fix from MS.
Refs #0