Merge topic 'fix-warnings'

44718539 Fix for extraneous semi-colon warning
0f44b620 Fix Wreserved-id-macro warning by removing double underscore
31d25023 Fix all Wold-style-cast warnings
6f4a1826 Fix Wmissing-variable-declarations by declaring variable in a header
f3d4b12b Fix Wmissing-prototypes warnings by making functions static
f771c009 Fix -Wunused-macros warning by defining under same conditions as usage
f9f6d67b Replace non-standard _snprintf with standard snprintf
704a63d4 Replace sprintf with snprintf

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !235