Version 1.6.3

[+] improvement : better implementation of singletons
[+] imporvement : better subroutine inheritance (cli)
[+] new feature : filename templates (cli)
[+] new feature : lyric blacklist (cli)
[-] changes : moving to tqdm for status report (cli)
[-] changes : less verbose log output
[-] changes : removal of Gooey implemenation
[-] chore : edit README
[-] cleanup : somehow lesser code