* external: Update CLI11 to tag v2.1.2
* external: Update dirent
* external: Update elfio to tag Release_3.9
* external: Update fmt to tag 8.0.1 and spdlog to tag v1.9.2
* external: Update glad
* external: Update googletest
* external: Update imgui to tag v1.85
* external: Update miniz to tag 2.2.0
* external: Update stb
* external: Update vita-toolchain
* external: Update yaml-cpp to tag yaml-cpp-0.7.0
* cmake: Add NOMINMAX globally to avoid Windows compilation issues with std::min/std::max
* main/net: add missing include files
* rtc: Remove convert_filetime/convert_timespec functions as they have been replaced with _wstat/stat
* external: Update better-enums to tag "0.11.3"
* external: Update CLI11 to tag "v1.9.1"
* external: Update elfio to tag "Release_3.8"
* external: Update glad to tag "0.1.34"
* external: Update googletest to tag "release-1.10.0"
* external: Update imgui to tag "v1.80"
* external: Update imgui_club
* external: Update miniz to tag "2.1.0"
* external: Update pugixml to tag "v1.11.4"
* external: Update spdlog to tag "v1.8.2"
* external: Update stb
* external: Update yaml-cpp to tag "yaml-cpp-0.6.3"
* external: Switch to vitasdk/vita-toolchain
* external: Refactor xxHash integration
