Cleanup for Doxytag generation #51

Job	Run time
macosx (clang++, -O0)	21s
linux (g++, -O0)	1m 53s
macosx (clang++, -O3 -flto -DNDEBUG)	27s
android (-O0)	19s
linux (clang++, -O0)	2m 6s
macosx (clang++, -O3 -flto -DNDEBUG -stdlib=libc++, -stdlib=libc++)	24s
android (-O3 -flto -DNDEBUG)	32s
icpx (-O0)	1m 12s
linux (clang++, -O3 -flto -DNDEBUG)	2m 8s
macosx (clang++, -O0 -stdlib=libc++, -stdlib=libc++)	31s
icpx (-O3 -flto -DNDEBUG)	1m 44s
linux (g++, -O3 -flto -DNDEBUG)	2m 7s
linux (clang++, -O3 -flto -DNDEBUG -stdlib=libc++, -stdlib=libc++)	2m 13s
wasm (-sNO_DISABLE_EXCEPTION_CATCHING -O0)	2m 12s
linux (clang++, -O0 -stdlib=libc++, -stdlib=libc++)	2m 7s
windows (Debug)	2m 32s
wasm (-sNO_DISABLE_EXCEPTION_CATCHING -O3 -flto -DNDEBUG)	3m 28s
windows (-T ClangCL, Debug)	3m 6s
windows (Release)	2m 3s
windows (-T ClangCL, Release)	2m 16s
	33m 41s

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