Refactor BuildOutput #1766

Job	Run time
Build Echidna on ubuntu-20.04	3m 36s
Build Echidna on ubuntu-20.04	3m 36s
Build Echidna on macos-latest	2m 23s
Build Echidna on macos-latest	2m 23s
Build Echidna on windows-latest	10m 14s
Build Echidna on windows-latest	10m 14s
Test with solc 0.4.25 on ubuntu-latest	3m 13s
Test with solc 0.4.25 on ubuntu-latest	3m 13s
Test with solc 0.5.7 on ubuntu-latest	3m 31s
Test with solc 0.5.7 on ubuntu-latest	3m 31s
Test with solc 0.6.12 on ubuntu-latest	3m 23s
Test with solc 0.6.12 on ubuntu-latest	3m 23s
Test with solc 0.7.5 on ubuntu-latest	4m 3s
Test with solc 0.7.5 on ubuntu-latest	4m 3s
Test with solc 0.4.25 on windows-latest	4m 31s
Test with solc 0.4.25 on windows-latest	4m 31s
Test with solc 0.5.7 on windows-latest	4m 57s
Test with solc 0.5.7 on windows-latest	4m 57s
Test with solc 0.6.12 on windows-latest	4m 59s
Test with solc 0.6.12 on windows-latest	4m 59s
Test with solc 0.7.5 on windows-latest	5m 58s
Test with solc 0.7.5 on windows-latest	5m 52s
	1h 41m 30s

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