Using https://github.com/asottile/pyupgrade
1. `__future__` imports and `coding: utf-8` were removed
2. Files were rewritten with `pyupgrade --py36-plus --keep-percent-format`
3. f-strings were cherry-picked from `pyupgrade --py36-plus`
Extractors are left untouched (except removing header) to avoid unnecessary merge conflicts
* All modules and binary names are changed
* All documentation references changed
* yt-dlp no longer loads youtube-dlc config files
* All URLs changed to point to organization account
Co-authored-by: Pccode66
Co-authored-by: pukkandan
Add auto-updating of youtube-dl version in ISSUE_TEMPLATE
Move parts of template text and adopt makefile to new format
Moved the 'kind-of-issue' section and rephrased a bit
Rephrased and moved Example URL section upwards
Moved ISSUE_TEMPLATE inside .github folder.
Update makefile to match new folderstructure