Move implementation out of interface headers #11

Job	Run time
nmake workflow	1m 32s
autoconf workflow using Default	19s
autoconf workflow using LLVM	23s
autoconf workflow using Debug	14s
autoconf workflow using Profiling	2m 3s
autoconf workflow using Address Sanitition	24s
autoconf workflow using Thread Sanitition	2m 2s
autoconf workflow using No Optimization	19s
autoconf workflow using Native Optimization	21s
autoconf workflow using Static Library	21s
autoconf workflow using zlib	2m 3s
autoconf workflow using zstd	23s
autoconf workflow using lz4	26s
autoconf workflow using lzma	25s
autoconf workflow using most features	27s
	11m 42s

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