Rework import mechanism #3642

Job	Run time
EasyCrypt compilation (nix)	39s
EasyCrypt compilation (opam)	2m 46s
Fetch EasyCrypt External Projects Matrix	3s
Check EasyCrypt Libraries (unit)	2m 44s
Check EasyCrypt External Projects (jasmin-eclib, https://github.com/jasmin-lang/jasmin, main, ecl...	3m 26s
Check EasyCrypt Libraries (stdlib)	6m 35s
Check EasyCrypt External Projects (sha3, https://gitlab.com/easycrypt/sha3, next, ., config/tests...	14m 50s
Check EasyCrypt Libraries (examples)	4m 36s
Check EasyCrypt External Projects (cryptobox, https://gitlab.com/fdupress/ec-cryptobox, next, ., ...	3m 50s
Check EasyCrypt External Projects (xsalsa20, https://gitlab.com/fdupress/ec-xsalsa, master, ., co...	3m 20s
Check EasyCrypt External Projects (xmss-acai, https://github.com/MM45/FV-XMSS-EC, master, ., conf...	9m 22s
Check EasyCrypt External Projects (xmss-fsai, https://github.com/MM45/FV-XMSS-EC, master, ., conf...	7m 55s
Check EasyCrypt External Projects (sphincsplus, https://github.com/MM45/FV-SPHINCSPLUS-EC, master...	22m 34s
Check EasyCrypt External Projects (set-status)	1s
Notification	3s
	1h 22m 44s

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