build: Prepare for release 1.0.20 #376

Job	Run time
code-format	33s
check_vvl	2m 5s
windows (amd64)	27m 23s
windows (amd64_x86)	28m 11s
mingw	21m 56s
linux (thread sanitizer, release, custom_hash_map ON )	23m 51s
linux (address sanitizer, release, custom_hash_map OFF )	41m 1s
linux (address sanitizer, release, custom_hash_map ON )	42m 0s
linux (undefined behavior sanitizer, debug)	26m 49s
Ubuntu Backcompat	12m 19s
	3h 46m 8s

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