Implement a hook-system that allows to add custom code to the initscripts at certain places

A function add_hook can be called from functions.d to register a hook function. The existing hooks
are based on suggestions from Michael Towers (larch) and on the implementation of initscripts-extras-fbsplash
which currently uses the strings passed to stat_busy and stat_done for this. More hooks can
be added if requested.

The implementation uses associative arrays and will thus only work with bash 4 or later

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