Resolve "Replace Overflow BASOP-Operators by overflow-free variants in lib_com"

Closes #1836 (closed)

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Files to do: ( grep "Overflow", "Ovf", "_o(" ) Places where _sat was set without knowing wether saturation may occur or not, is marked with comment //??sat

status	file	comment
DONE	arith_coder_fx.c	no //??sat marking
NO NEED	basop32.c	no //??sat marking
NO NEED	basop32.h	no //??sat marking
NO NEED	basop_lsf_tools.c	no //??sat marking
DONE	basop_util.c	no //??sat marking
DONE	bitalloc_fx.c	no //??sat marking
DONE	cldfb_evs_fx.c	no //??sat marking
DONE	cldfb_fx.c	no //??sat marking
DONE	cng_exc_fx.c	no //??sat marking
DONE	codec_tcx_common_fx.c	no //??sat marking
DONE	deemph_fx.c	no //??sat marking
DONE	edct_fx.c	no //??sat marking
NO NEED	enh1632.c	no //??sat marking
NO NEED	enh1632.h	no //??sat marking
NO NEED	enh32.c	no //??sat marking
NO NEED	enh40.c	no //??sat marking
NO NEED	enh40.h	no //??sat marking
NO NEED	enh64.c	no //??sat marking
NO NEED	enh64.h	no //??sat marking
NO NEED	enhUL32.c	no //??sat marking
DONE	enr_1_az_fx.c	LEFT ASIS - no //??sat marking
DONE	env_stab_fx.c	LEFT IN env_stability_fx() - no //??sat marking
DONE	fd_cng_com_fx.c	no //??sat marking
DONE	fft_fx_evs.c
DONE	fft_rel_fx.c	nothing don
DONE	frame_ener_fx.c
DONE	get_gain_fx.c
DONE	gs_bitallocation_fx.c
DONE	gs_bitallocation_ivas_fx.c
DONE	gs_gains_fx.c
DONE	gs_noisefill_fx.c
DONE	hp50_fx.c
DONE	hq2_bit_alloc_fx.c
DONE	hq2_core_com_fx.c
DONE	hq2_noise_inject_fx.c
DONE	ifft_rel_fx.c
DONE	igf_base_fx.c	IGFCommonFuncsCalcSfbEnergyPowerSpec(): L_macNs_CO and L_add_co kept
DONE	interpol_fx.c
DONE	log2.c	kept all _o
DONE	low_rate_band_att_fx.c
DONE	lpc_tools_fx.c
DONE	lsf_tools_fx.c	E_LPC_f_isp_a_conversion(), lsp2lpc_fx(), E_LPC_f_lsp_pol_get() : kept _o
DONE	lsp_conv_poly_fx.c
DONE	math_op.c	Dot_product12_o() - kept _o
NO NEED	math_op.h
DONE	modif_fs_fx.c
DONE	oper_32b.c
DONE	phase_dispersion_fx.c
DONE	ppp_fx.c
DONE	pred_lt4_fx.c
DONE	preemph_fx.c
NO NEED	prot_fx.h
DONE	pvq_com_fx.c
DONE	residu_fx.c
DONE	stat_noise_uv_mod_fx.c
DONE	swb_bwe_com_fx.c	Leave some _o ops in calc_tilt_bwe_fx()
DONE	swb_bwe_com_lr_fx.c
DONE	swb_tbe_com_fx.c
DONE	syn_filt_fx.c
DONE	tcx_ltp_fx.c
DONE	tcx_mdct_fx.c
DONE	tcx_utils_fx.c
DONE	tns_base.c
DONE	tools_fx.c	keep __o op partially: conv_fx(), conv_fx_32(), Calc_Energy_Autoscaled(), dot_prod_satcontr()
DONE	weight_a_fx.c
DONE	wi_fx.c
DONE	window_fx.c