code cleanup: use bash4 associative arrays for filesystem stuff

now the information about which setup programs for filesystems, label
programs, which FS'es can go on which blockdevices, need/can have
labels, can be mounted and FS friendly names are in a central place
in libs/lib-blockdevices-filesystems.sh.
This simplifies the code somewhat where you actually want to work with
the filesystems.
Also, we only check the available filesystem utilities once at program
startup, causing a performance improvement.

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