Percentage: prepare to make threshold configurable #660

Job	Run time
spellcheck	14s
Linux	4m 11s
MacOS	11m 40s
Linux build test (ubuntu-22.04, gcc, g++, ON)	1m 33s
Win32	8m 30s
Linux build test (ubuntu-22.04, gcc, g++, OFF)	1m 8s
Win64	2m 9s
Linux build test (ubuntu-22.04, clang, clang++, ON)	1m 41s
Linux build test (ubuntu-22.04, clang, clang++, OFF)	1m 12s
FreeBSD	8m 4s
Linux build test (ubuntu-22.04, musl-gcc, musl-g++, OFF)	59s
Linux build test (ubuntu-20.04, gcc, g++, ON)	1m 22s
Linux build test (ubuntu-20.04, gcc, g++, OFF)	1m 8s
Linux build test (ubuntu-20.04, clang, clang++, ON)	1m 22s
Linux build test (ubuntu-20.04, clang, clang++, OFF)	1m 35s
Linux build test (ubuntu-20.04, musl-gcc, musl-g++, OFF)	57s
Release	0s
	47m 45s

Provide feedback