Update to clang-format-5 and reformat the codebase 

This reverts commit bd6530b5.

I'm reverting the change to precision in Parameter.h for now because this is causing test failures which are out of scope for this PR.

Re #21749

Moved code from FindPeaksMD into new method on Goniometer. Then added option onto peaks workspace.

This includes dragging the libcxx implementation of normal_distribution
and uniform_int_distribution into our source. MSVC, clang and gcc don't
agree on how this should be implemented leading to problems with
comparing test results across platforms. Using a single implementation
gives the same results on each platform.

No need for exclusion ranges, so code is cleaner. There is however now recursion, so performance will need to be tracked.

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Merge done to enable documentation be be fixed, because of removal of
alias directive and addition of related algorithms directive.

Signed-off-by: Karl Palmen <karl.palmen@stfc.ac.uk>

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