make Util_GetHandle case insensitive

Util_GetHandle is the flesh routine behind such routines CCTK_ReductionHandle, CCTK_InterpHandle that return some kind of operation handle based on a name. Most other strings in Cactus are case insensitive eg the thorn or variable names in CCTK_VarDataPtr, the boundary condition names.

Since the interpolator name that is passed to CCTK_InterpHandle us often a user specifiable parameter it might be good to also use case insensitive string comparison in Util_GetHandle.

Aside: Util_GetHandle is not documented but also not declared as private.

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