added BuildInfo struct and updated get_build_info #58

Job	Run time
Clippy (beta)	14s
Bitrot check	1m 8s
Latest build on ubuntu-latest	36s
Clippy (MSRV)	2m 9s
Latest build on windows-latest	39s
Code coverage	2m 30s
Latest build on macOS-latest	53s
Intra-doc links	1m 12s
Rustfmt	4s
Test on ubuntu-latest	1m 41s
Test on windows-latest	1m 44s
Test on macOS-latest	2m 4s
	14m 54s

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