Align C++23 / C17 as the project dialect - #8548
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VS vs/vs2026 props own stdcpp23 + stdc17 so app templates and openframeworksLib no longer stamp stdcpplatest over the core lib. macos/tvOS match osx at c++23/c17 and drop AGL. make prefers -std=c++23 with a c++2b fallback on older Apple Clang. vs2019 stays C++17 for that toolchain. Fixes openframeworks#8547
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Summary
vs/vs2026) tostdcpp23+stdc17inopenFrameworksCommon.propsand stop app templates /openframeworksLib.vcxprojfrom overridingLanguageStandardstdcpplateston the app while the core lib stayed at C++17 (std::result_of/ ODR)c++23/c17; macos drops AGL (gone in macOS 26) and picks up Foundation / SystemConfiguration / Metal-std=c++23, falls back to-std=c++2bon Apple Clang 15 CLIvs2019stays C++17 for that toolchainFixes #8547
Validation
xcrun clang++ -std=c++23succeeds on Apple Clang 21 and selects-std=c++23git diff --checkon the 19 template/props filesCI will confirm VS / Xcode / make builds against apothecary C++23 libs.