Add diagonal and 8-quadrant symmetry tests #305

Job	Run time
build (windows-latest, RelWithDebInfo, gui, lua)	16m 38s
build (windows-latest, Debug, cli, lua)	18m 20s
build (windows-latest, Debug, cli, noscripts)	17m 29s
build (macos-latest, RelWithDebInfo, gui, lua)	8m 50s
build (macos-latest, Debug, cli, lua)	13m 13s
build (macos-latest, Debug, cli, noscripts)	10m 56s
build (ubuntu-latest, RelWithDebInfo, gui, lua)	11m 28s
build (ubuntu-latest, Debug, cli, lua)	16m 46s
build (ubuntu-latest, Debug, cli, noscripts)	15m 39s
	2h 9m 19s

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