Ring struct in a separate file #3227

Job	Run time
ubuntu-clang-deprecated Debug	22m 22s
ubuntu-clang-deprecated Release	24m 16s
ubuntu-clang-quaternions Debug	21m 47s
ubuntu-clang-quaternions Release	23m 13s
ubuntu-clang-tbb Debug	22m 8s
ubuntu-clang-tbb Release	24m 27s
ubuntu-clang-cayleymap Debug	22m 19s
ubuntu-clang-cayleymap Release	22m 35s
ubuntu-clang-system-libs Debug	22m 51s
ubuntu-clang-system-libs Release	23m 2s
ubuntu-no-boost Debug	22m 36s
ubuntu-no-boost Release	22m 8s
ubuntu-no-unstable Debug	17m 55s
ubuntu-no-unstable Release	18m 47s
	5h 10m 26s

Provide feedback