add clamp test

ModNEF_Sources/modules/neurons/BLIF/beta_lif.vhd

ModNEF_Sources/modules/neurons/BLIF/blif_parallel.vhd

ModNEF_Sources/modules/neurons/BLIF/blif_sequential.vhd

ModNEF_Sources/modules/neurons/BLIF/rblif_parallel.vhd

ModNEF_Sources/modules/neurons/BLIF/rblif_sequential.vhd

...F_Sources/modules/neurons/ShiftLif/rshiftlif_parallel.vhd

...Sources/modules/neurons/ShiftLif/rshiftlif_sequential.vhd

ModNEF_Sources/modules/neurons/ShiftLif/shift_lif.vhd

...EF_Sources/modules/neurons/ShiftLif/shiftlif_parallel.vhd

..._Sources/modules/neurons/ShiftLif/shiftlif_sequential.vhd

modneflib/modnef/arch_builder/modules/BLIF/blif.py

modneflib/modnef/arch_builder/modules/BLIF/rblif.py

modneflib/modnef/arch_builder/modules/ShiftLIF/rshiftlif.py

modneflib/modnef/arch_builder/modules/ShiftLIF/shiftlif.py

...dnef/modnef_torch/modnef_neurons/srlif_model/rshiftlif.py

...odnef/modnef_torch/modnef_neurons/srlif_model/shiftlif.py

modneflib/modnef/quantizer/fixed_point_quantizer.py

modneflib/modnef/quantizer/quantizer.py