Some improvements & refactoring #32

Job	Run time
build (ubuntu-latest, ghcr.io/phusion/holy-build-box/hbb-64, bash, gcc, digilivolo, Release)	8m 3s
build (ubuntu-latest, debian:10, bash, gcc, digilivolo, Release)	54s
build (ubuntu-20.04, bash, gcc, digilivolo, digilivolo-linux-x86_64, Release)	28s
build (ubuntu-latest, alpine.sh {0}, i386, digilivolo, digilivolo-linux-static-i386, Release)	55s
build (ubuntu-latest, debian, bash, armhf, digilivolo, digilivolo-linux-armhf, Release)	1m 13s
build (ubuntu-latest, debian, bash, arm64, digilivolo, digilivolo-linux-arm64, Release)	1m 2s
build (ubuntu-20.04, bash, clang, digilivolo, Release)	31s
build (windows-latest, msys2 {0}, gcc, digilivolo.exe, digilivolo-win-x86_64.exe, Release)	2m 20s
build (windows-latest, pwsh, gcc, digilivolo.exe, Release)	1m 29s
build (windows-latest, pwsh, clang, digilivolo.exe, Release)	3m 28s
	20m 23s

Provide feedback