Implement rule 28-6-1, only move non-const lvalues#992

MichaelRFairhurst wants to merge 4 commits intomaingithub/codeql-coding-standards:mainfrom

michaelrfairhurst/preconditions5-only-std-move-lvaluesgithub/codeql-coding-standards:michaelrfairhurst/preconditions5-only-std-move-lvaluesCopy head branch name to clipboard