Integration of fixed point sub-functions 16

[x] Some of EVS_FLOAT macro dependency removal done
[x] Clean up of intermediate buffers, float variables/buffers in different structures
[x] Build warnings fix
[x] added rescaling in decod_gen_2sfbr
[x] ivas_spar_update_md_hist, ivas_spar_smooth_md_dtx, ivas_spar_setup_md_smoothing converted to fixed point
[x] Converted few functions in ivas_dirac_output_synthesis_dec.c file