v0.89 (TV-Series mode technically complete)

v0.89 is now finished. This introduces TV-Series mode, and also adds support for adding season folders (containing episodes) manually downloaded from OpenSubtitles. This will greatly increase the speed at which you can synchronize your favorite series. Hopefully it's useful! All that rests for me is to properly test the feature using my own library and add some small features (API quota threshold detection) and some bugfixes, and we'll go up to v0.9 and definitively launch the BETA phase of Subservient!