Remove MD5 hashing from UBFileSystemUtils

[Vekhir]

The functions MD5_Init, MD5_Update, MD5_Final are deprecated in OpenSSL 3.0. This leads to warnings during compilation.

Use EVP_Q_digest instead. Edit: Since the utility functions md5 and md5InHex are not used anywhere, just remove them.

[letsfindaway]

I have another proposal: The MD5 functions can safely be removed from UBFileSystemUtils as nobody is using them. And if there would be some future use, then QCryptographicHash already provides all this functionality.

[Vekhir]

True. I've checked out how the widgets sums are calculated and they use QCryptographicHash.

I've updated the commit to just remove those functions.

[letsfindaway]

Please remove them also from the header file.

[Vekhir]

Done