App: Align Document to best practices (#21059)
* use static cast * join declaration and definition * don't hide previous declaration * initialize in declaration * redundant else * reserved identifier * endl * implicit conversion * narrowing * always false * replace define with constexpr * return and continue * avoid copy * multiple declarations in line * use auto * member initialize * uninitialized * range based loop * move to inner scope * redundant * const, mainly * function parameter descriptions * misc --------- Co-authored-by: bofdahof <172177156+bofdahof@users.noreply.github.com>
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