Added a new protokernel to substitute update_local_code function,
inside tracking: volk_gnsssdr_32fc_s32f_x4_update_local_code_32fc
Volk implementation is 7x times faster than generic implementation.
Improved 8ic_x7_cw_epl_corr_32fc_x5 protokernels and added a new
protokernel called volk_gnsssdr_32fc_convert_8ic in order to test the 8
bits protokernels in the tracking.
Created the proto-kernels volk_gnsssdr_8ic_x7_cw_epl_corr_32fc_x5 and
volk_gnsssdr_8ic_x7_cw_epl_corr_TEST_32fc_x5
Created two new quicker implementations for
volk_gnsssdr_8ic_x7_cw_epl_corr_32fc_x5 and their macros:
volk_gnsssdr_8ic_x7_cw_epl_corr_safe_32fc_x5
volk_gnsssdr_8ic_x7_cw_epl_corr_unsafe_32fc_x5