[FEATURE] allow providing multiple BUs at once

[JoernBerkefeld]

instead of running mcdev retrieve cred/bu1; mcdev retrieve cred/bu2 one could add a new array-option --bu

aliases of this should be --bf and --btfor compatibility withbuild`.

that would allow us to run the above command like this: mcdev retrieve --bu cred/bu1 cred/bu2 or mcdev retrieve --bu cred/bu1 --bu cred/bu2

the previous option of allowing cred/* and * should still be offered. If found any other bu-values that match the * should be removed automatically:

conversion table:

option given	parsed version
--bu * cred/bu	--bu *
--bu cred/* cred/bu	--bu cred/*
--bu cred/bu cred/bu	--bu cred/bu
--bu cred/bu1 cred/bu2	--bu cred/bu1 cred/bu2

[JoernBerkefeld]

fyi @anasilva105