client is renamed hydrus_client. Lots of build lines to test here, so let's see how it goes
closes #1254
closes #1239, closes #1235
closes #770
SQLITE and MPV DLLs are now included, workflow should cache better. Dedicated requirements due to big differences between OSes. SPEC now includes all needed DLLs, cloudscraper folder, cv2 ffmpeg dll and hydrus source.