entry_to_string function implemented #1151

Job	Run time
linux, all features disabled, debug	1m 40s
linux, with c++, debug	46s
linux, all features disabled, release	3m 30s
linux, with c++, release	1m 13s
linux, debug	3m 59s
linux, debug, ansi	4m 25s
linux, fuzzer build	21s
linux, release	6m 25s
linux, release, ansi	6m 25s
linux, release, single file library	5m 48s
linux, release, static library	8m 2s
	42m 34s

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