Previous assertion violations because of NaN from std::round were
in video streaming, see commits 27d58ba07b, 8f5830d520.
Now the crashes happened in the ConvertScale() call from a background
thread when preparing an image from clipboard for sending to a chat.
- This file is needed to store same code parts related
to management of dictionaries and emoji sets.
- Moved extracting of zip files to storage_cloud_blob.