Adding cleanup script to only keep files that are used in 26.252

#!/usr/bin/env python3

from pathlib import Path

import os

files = ['Readme_IVAS_JBM_dec.txt','Readme_IVAS_dec.txt','Readme_IVAS_enc.txt','Readme_IVAS_rend.txt'];

used_files = []

kept = 0

removed = 0

for file in files:

    with open(file,"r") as fp:

        for line in fp:

            for item in line.split():

                if "$TESTV_PATH" in item or "$REF_PATH" in item:

                    used_files.append(Path(item).name)

print(f"Identified {len(used_files)} files from scripts")

for dirpath, subdirs, files in os.walk("testvec"):

    for file in files:

        if file in used_files:

            kept = kept + 1

        else:

            removed = removed + 1

            os.remove(os.path.join(dirpath, file))

print(f"Removed {removed} files")

print(f"Kept {kept} files")

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