Fix chord detection and preset metadata

applied the comments regarding chord progression, scale suggestions and UI/UX changes

some minor UI changes: adding the playback functionality for the chosen section with no key and bpm change and replacing the upload new with choose a different song

deleted the server and client side decoding so the play back is ready instantly after loading the stems

added the looping function and changing the key and bpm of portion of the song

adding post processing and increasing the number of co-current processes

updated the MVP-Initial upload