Avoid relying on function name decay mechanics

Set default value to registry::err_handler_

Fix: prevents MSVC warning flags to propagate in CUDA

better numeric_limits<>::max/min fix when using SPDLOG_WCHAR_TO_UTF8_SUPPORT

NOMINMAX macro doesn't work everytime for some reason

Initializer list style consistency

add constexpr to SPDLOG_LEVEL_NAMES declaration

fix compiling error and typo

Better support for / separators on Windows, improve wchar filename coverage

for #1791

Open files with "ab" mode even if truncating.