Rust

Rename `FIXED_MAP` flag name #476

Job	Run time
Check all the features of the heed project (ubuntu-latest)	19s
Test the heed project (ubuntu-latest)	43s
Check all the features of the heed project (macos-latest)	22s
Test the heed project (windows-latest)	3m 21s
Test the heed project (macos-latest)	46s
Check all the features of the heed3 project (ubuntu-latest)	21s
Check the heed3 project (ubuntu-latest)	29s
Check all the features of the heed3 project (macos-latest)	39s
Ensure clippy is happy on heed and heed3	31s
Check the heed3 project (windows-latest)	2m 36s
Run the heed examples (ubuntu-latest)	32s
Check the heed3 project (macos-latest)	23s
Run the heed examples (macos-latest)	42s
Ensure the heed and heed3 project are formatted	12s
Run the heed3 examples (ubuntu-latest)	36s
Test the heed3 project (ubuntu-latest)	43s
Ensure heed3 is not erasing heed	3s
Test the heed3 project (windows-latest)	2m 50s
Run the heed3 examples (macos-latest)	23s
Test the heed3 project (macos-latest)	46s
	17m 17s

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