Add usage filters to executable_modifiers #1329
Merged
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This merge allows executable_modifiers defined within modifiers to apply usage filters. Usage filters can change what the rules are for applying an executable_modifier to a given executable. Pre-defined filters include "None" (i.e. no restrictions), "once" (only apply once), "first_mpi" (apply to the first MPI executable), or "all_mpi" (apply to all MPI executables).
Modifiers can define their own additional usage_filters as well, to change the logic.