Similar to #2319 this removes use of static variables in the all chain for Fortran scheduled functions, making it possible to call them from CarpetX. It also removes a use of a string-based group lookup which linearly travered a linked list and had a malloc/free pair for each lookup.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2884/remove-static-variables-used-in-fortran