Bumped version to 2.5.0 + generated single header files. #129

Job	Run time
macOS 14 AppleClang 15 C++20	2m 25s
macOS 15 AppleClang 17 C++14	1m 40s
macOS 15 AppleClang 17 C++23	1m 57s
macOS 15 AppleClang 17 C++11	1m 31s
macOS 15 AppleClang with sanitizers	2m 49s
macOS 14 AppleClang 15 C++11	43s
macOS 15 AppleClang 17 C++26	2m 22s
macOS 15 AppleClang 17 C++17	1m 33s
macOS 15 AppleClang 17 C++20	1m 24s
	16m 24s

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