cmake: Enable -Wformat=2 warnings
cmake: Enable -Wimplicit-atomic-properties warnings
cmake: Enable -Wmissing-delarations -Wmissing-prototypes warnings
cmake: Enable -Woverlength-strings warning
cmake: Enable -Wstrict-selector-match warning
cmake: Enable -Wundeclared-selector warning
cmake: Enable -Wunreachable-code warning