CMake

Refactor comparison logic in solver.cpp; use references for atom and … #373

Job	Run time
build (ubuntu-latest, Debug, ON, ON)	6m 16s
build (ubuntu-latest, Debug, ON, OFF)	6m 31s
build (ubuntu-latest, Debug, OFF, ON)	6m 29s
build (ubuntu-latest, Debug, OFF, OFF)	6m 39s
build (ubuntu-latest, Release, ON, ON)	1m 37s
build (ubuntu-latest, Release, ON, OFF)	1m 40s
build (ubuntu-latest, Release, OFF, ON)	1m 39s
build (ubuntu-latest, Release, OFF, OFF)	1m 34s
build (windows-latest, Debug, ON, ON)	2m 11s
build (windows-latest, Debug, ON, OFF)	1m 56s
build (windows-latest, Debug, OFF, ON)	1m 42s
build (windows-latest, Debug, OFF, OFF)	2m 25s
build (windows-latest, Release, ON, ON)	2m 42s
build (windows-latest, Release, ON, OFF)	2m 22s
build (windows-latest, Release, OFF, ON)	2m 41s
build (windows-latest, Release, OFF, OFF)	2m 45s
build (macos-latest, Debug, ON, ON)	1m 11s
build (macos-latest, Debug, ON, OFF)	1m 44s
build (macos-latest, Debug, OFF, ON)	1m 8s
build (macos-latest, Debug, OFF, OFF)	1m 11s
build (macos-latest, Release, ON, ON)	1m 32s
build (macos-latest, Release, ON, OFF)	1m 17s
build (macos-latest, Release, OFF, ON)	1m 50s
build (macos-latest, Release, OFF, OFF)	1m 18s
	1h 2m 20s

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