Update to clang-format-5 and reformat the codebase 

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

Re #22963.

re #22815

Re #22794

Refs #22733

The ISISRAW pointer in LoadRawHelper is only required when a file
is being read and not when the object is constructed. Delaying the
creation of this instance cuts out a lot of work/logging when just
creating a LoadRaw instance that is not used.
Refs #22733

Refs #21907

Re #22500.

This is based on a reply from Freddie when I recently asked him about
this.

In order to allow LoadNexusMonitors to use it, they need to be made
static.

Refs #21907