EVS fixed path bring-up

[x] All fixed point changes needed for EVS pulled.
[x] EVS_FLOAT macro to be disabled in options.h for EVS Fixed to work.
[x] Tested for EVS "26444_ce0_da0_e60_f40_g50-TestSeq_BASOP_26442" bit exactness with EVS fixed code. 978 out of 979 bit exact. One stream to be debugged.
[x] With EVS_FLOAT, one file additional failure observed with pytest as compared to previous version.
[x] By default, EVS fixed is disabled. Will be enabled while IVAS path bringup is done.
[x] Cleanup to be done.
[x] Warnings to be fixed.
[x] Tested with MSVS. GCC compiler fixes to be done.