LADSPAStream: Special optimization for constant input port mappings

 * Constants were converted to infinite streams.
   This allows them to be handled specially. They are stored in their own
   input buffer now, initialized and connected once but need no ticking.
 * In contrast to the Applause primitives, this can be done centrally and
   for all possible LADSPA plugins.
 * This gives a speed increase of up to 20% if all input ports are mapped
   to constants (measured with the "sine" plugin).

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