Move implementation out of interface headers #12

Job	Run time
nmake workflow	1m 48s
autoconf workflow using Default	1m 2s
autoconf workflow using LLVM	1m 1s
autoconf workflow using Debug	46s
autoconf workflow using Profiling	58s
autoconf workflow using Address Sanitition	1m 1s
autoconf workflow using Thread Sanitition	57s
autoconf workflow using No Optimization	44s
autoconf workflow using Native Optimization	59s
autoconf workflow using Static Library	59s
autoconf workflow using zlib	1m 0s
autoconf workflow using zstd	1m 0s
autoconf workflow using lz4	1m 0s
autoconf workflow using lzma	1m 2s
autoconf workflow using most features	1m 0s
	15m 17s

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