address HRTF leftovers

• Related issues:
• Requested reviewers: @emerit

Reason why this change is needed

• This MR addresses leftovers from HRTF udpates:

1. address ToDo comment

} HRTFS_DATA, *HRTFS_HANDLE, HRTFS_CREND_DATA, *HRTFS_CREND_HANDLE; // VE: all instance of HRTFS_DATAand *HRTFS_HANDLE should be renamed to HRTFS_CREND_DATA and *HRTFS_CREND_HANDLE

and consequently update names of these two structure types / handles.

2. rename IVAS_DEC_HRTF_HANDLE to IVAS_DEC_HRTF_TD_HANDLE and IVAS_REND_GetHrtfHandle to IVAS_REND_GetHrtfTdHandle
3. rename hSetOfHRTF to hHrtfCrend such that the later name is used consistently across the framework
4. correct comments

Description of the change

• Resolve leftovers from HRTF udpates and ensures the float main is aligned with BASOP. -> There is no need to port this MR to BASOP.

Affected operating points

• All is BE.