Rust

Combined version of LMDB mdb.master and mdb.master3 #362

Job	Run time
Check the heed3 project (ubuntu-latest)	23s
Check the heed3 project (windows-latest)	1m 21s
Check the heed3 project (macos-latest)	36s
Run the heed examples (ubuntu-latest)	26s
Check all the features of the heed3 project (ubuntu-latest)	23s
Check all the features of the heed project (ubuntu-latest)	22s
Run the heed examples (macos-latest)	34s
Check all the features of the heed3 project (macos-latest)	41s
Check all the features of the heed project (macos-latest)	31s
Ensure the heed project is formatted	11s
Run the heed3 examples (ubuntu-latest)	23s
Test the heed project (ubuntu-latest)	40s
Test the heed project (windows-latest)	1m 51s
Run the heed3 examples (macos-latest)	39s
Ensure heed3 is not erasing heed	4s
Test the heed project (macos-latest)	53s
	9m 58s

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