Rust

Combined version of LMDB mdb.master and mdb.master3 #352

Job	Run time
Run the heed examples (ubuntu-latest)	28s
Check all the features of the heed project (ubuntu-latest)	23s
Check all the features of the heed3 project (ubuntu-latest)	35s
Check the heed3 project (ubuntu-latest)	36s
Run the heed examples (macos-latest)	32s
Check all the features of the heed project (macos-latest)	29s
Check all the features of the heed3 project (macos-latest)	28s
Check the heed3 project (windows-latest)	1m 31s
Check the heed3 project (macos-latest)	27s
Ensure the heed project is formatted	12s
Run the heed3 examples (ubuntu-latest)	25s
Run the heed3 examples (macos-latest)	43s
Test the heed project (ubuntu-latest)	40s
Test the heed project (windows-latest)	1m 45s
Test the heed project (macos-latest)	37s
	9m 51s

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