Draft: [WIP][ref-using-main][non-BE][split-non-BE] Convert FastConv tables to 16 bit

• Related issues: #1123 (closed)
• Requested reviewers: @emerit

⚠ This branch is based on orange/fixpoint_crend_hrtf_file_format.

The MR can be cleaned up to target main instead, currently WIP to trigger pipelines.

Some additional general scripts fixes were added to this MR, but can be also reverted (88df2025).

Reason why this change is needed

• Conversion of FastConv tables from float to int16_t resulting in memory reduction
• This branch also includes fixes for the HRTF scripts

Description of the change

• FastConv ROM tables and scripts were modified to generate 16 bit values

Affected operating points

• Binaural rendering with FastConv is nonBE
• Only affects decoder output, no bitstream impact